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Highly water-absorptive ocular lens material

A highly water-absorptive ocular lens material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:
Patent number: 4920180
Filing date: Mar 8, 1989
Issue date: Apr 24, 1990
Inventors: Nobuyuki Toyoshima, Takanori Shibata, Atsushi Hirashima
Assignee: Menicon Co., Ltd.
Primary Examiner: T. McDonald, Jr.


What is claimed is:

1. A highly water absorptive ocular lens material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:

(A) from 2 to 30 parts by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolymerizing (a) an alkyl (meth)acrylate monomer and (b) a monomer having at least two polymerizable groups per molecule, as the main components;
(B) from 70 to 98% by weight of a fatty acid vinyl ester; and
(C) from 0.02 to 3.0 parts by weight of a cross linking agent which is a compound of the formula:

R.sub.6 (O(CH.sub.2).sub.a).sub.b O--R.sub.7 (II)

wherein each of R.sub.6 and R.sub.7 which may be the same or different, is --CH.dbd.CH.sub.2 or --CH.sub.2 --CH.dbd.CH.sub.2, and each of a and b is an integer of from 0 to 5, provided that when a is 0, b is 0; or the formula: ##STR6## wherein R.sub.6 and R.sub.7 are as defined above, R.sub.8 is --CH.dbd.CH.sub.2 or --CH.sub.2 --CH.dbd.CH.sub.2, each of R.sub.9 and R.sub.10 which may be the same or different, is a hydrogen atom, --CH.sub.3, (CH.sub.2).sub.g --OH wherein g is an integer of from 1 to 5, (CH.sub.2 CH.sub.2 O ).sub.h R.sub.11 wherein R.sub.11 is a hydrogen atom or --CH.sub.3, and h is an integer of from 0 to 12, or --COOR.sub.11 wherein R.sub.11 is as defined above, c is an integer of from 0 to 3, is an integer of from 0 to 500, e is an integer of from 1 to 10,000, and f is an integer of from 0 to 3,

provided that the total amount of polymer (A) and monomer (B) is 100 parts by weight.

2. The ocular lens material according to claim 1, wherein the alkyl (meth)acrylate monomer (a) is at least one member selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth) acrylate, dodecyl (meth)acrylate, cyclohexyl (meth)acrylate, trifluoroethyl (meth)acrylate, pentafluoroisopropyl (meth)acrylate and hexafluoroisopropyl (meth) acrylate.

3. The ocular lens material according to claim 1, wherein the monomer (b) is at least one member selected from the group consisting of allyl (meth) acrylate, vinyl (meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth) acrylate, triethylene glycol di(meth)acrylate and dipropylene glycol di(meth)acrylate.

4. The ocular lens material according to claim 1, wherein the (meth)acrylate polymer (A) has (c) a hydrophilic group-containing (meth)acrylate monomer copolymerized with the monomers (a) and (b).

5. The ocular lens material according to claim 4, wherein the (meth)acrylate monomer (c) has a hydrophilic group selected from the group consisting of an alkoxypolyalkylene glycol residue, an amido group, an N-substituted amido group, an amino group, an N-substituted amino group, a carboxyl group, a hydroxyl group and a polyalkylene glycol residue.

6. The ocular lens material according to claim 1, wherein the (meth)acrylate polymer (A) is obtained by copolymerizing from 65 to 99.95 mol parts of the alkyl (meth)acrylate monomer (a), from 0.05 to 5 mol parts of the monomer (b) and from 0 to 30 mol parts of (c) a hydrophilic group-containing (meth)acrylate monomer.

7. The ocular lens material according to claim 1, wherein the (meth)acrylate polymer (A) has a number average molecular weight of from about 5,000 to about 200,000.

8. The ocular lens material according to claim 1, wherein the (meth)acrylate polymer (A) has a number average molecular weight of from 10,000 to 100,000 and contains from 1 to 5 polymerizable groups per molecule on an average.

9. The ocular lens material according to claim 1, wherein the polymer (A) has the formula: ##STR7## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different, is a hydrogen atom or a methyl group, R.sub.4 is an alkyl group, A is a polymerizable group selected from the group consisting of an allyl group, a vinyl group and a (meth)acryloyl group, R.sub.5 is a hydrophilic group, and p, q and r are integers satisfying 0.002.ltoreq.q/(p+q+r).ltoreq.0.05 and 0.ltoreq.r/(p+q+r).ltoreq.0.03.

10. The ocular lens material according to claim 1, wherein the fatty acid vinyl ester (B) is at least one member selected from the group consisting of vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl stearate, vinyl monochloroacetate, vinyl trifluoroacetate and vinyl trichloroacetate.

11. The ocular lens material according to claim 1, wherein a part of the monomer (B) is susbstituted by (D) at least one hydrophilic monomer selected from the group consisting of a polymerizable group-containing lactam, an alkoxypolyalkylene glycol mono(meth)acrylate, a (meth)acrylamide, an N-mono-substituted (meth)acrylamide, an N,N-disubstituted (meth)acrylamide, a (meth)acryloyloxyalkylamine, an N-mono-substituted (meth)acryloyloxyalkylamine, an N,N-disubstituted (meth)acryloyloxy alkylamine, (meth)acrylic acid and a hydroxyl group-containing (meth)acrylate.

12. A contact lens made of the ocular lens material as defined in claim 1.

Abstract


A pressurized water supply system for a dental unit-chair comprising a water purifier purifying or sterilizing water from a water supply source, and supplying the water to which a given pressure is applied to a medical instrument instrument. A pressurized water supply device for a dental unit-chair includes a case, an inflow tube provided to the case and connected to a water supply source, a pump installed within the case and connected to the inflow tube to jet out the water from the water supply source under a given pressure, a water purifier provided to the case in multi-stage and removing various alien substances, chemical substances, heavy metals, ions, germs, etc. from the water supplied from the pump, and
Patent number: 6179613
Filing date: Mar 29, 1999
Issue date: Jan 30, 2001
Inventor: Won Dong Yang


What is claimed is:

1. Apparatus for supplying pressurized water to a dental instrument and pressurized, purified water to an associated drinking water basin, comprising:

an inlet line adapted for connection to a water supply source to receive inlet water therefrom,
a preliminary filter means connected to said inlet line,
a pump for pressurizing the inlet water after passage through the preliminary filter means,
a further filter means connected to said pump, said further filter means including a carbon filter and a reverse osmotic filter,
a connecting line between said further filter means and an auxiliary filter,
said auxiliary filter having an outlet connected to said drinking water basin,
a further line connect to said connecting line at a location between said further filter means and said auxiliary filter,
an electric heater connected by a branch line to said further line for heating pressurized water therein,
said heater having an outlet connected to said dental instrument for supplying heated pressurized water thereto,
a pressure control means in said further line downstream of said branch line, and
a storage tank connected to said pressure control means for storing pressurized water and maintaining the water above a specific minimum pressure, said storage tank being connected to deactivate said pump when a given maximum pressure is reached in said storage tank, said storage tank supplying pressurized water therein to said drinking water basin and to said heater, when said pump is deactivated and until said minimum pressure is reached whereupon said pump is re-activated.

2. Apparatus for supplying pressurized, heated water to a dental instrument and pressurized purified drinking water to an associated drinking water basin comprising:

a casing having an inlet connection for receiving supply water, a first outlet connection to supply pressurized, heated water to said dental instrument, and a second outlet connection to supply purified drinking water to said water basin,
a preliminary filter means connected to said inlet connection for filtering said supply water at said inlet connection,
a pump connected to said preliminary filtering means for pressurizing the inlet water after passage through the preliminary filtering means,
a further filtering means connected to said pump,
a connection line connecting said further filter means and an auxiliary filter, said auxiliary filter being connected to said second outlet connection for supplying pressurized, filtered water thereto,
a further line connected to said connecting line at a location between said further filter means and said auxiliary filter,
an electric heater connected by a branch line to said further line for heating pressurized water therein,
said heater having an outlet connected to said first outlet for supplying heated pressurized water to said dental instrument,
a pressure control means in said further line downstream of said branch line, and
a storage tank connected to said pressure control means for storing pressurized water therefrom and maintaining the water above a specific minimum pressure, said storage tank being connected to deactivate said pump when a given maximum pressure is reached in said storage tank, said storage tank supplying pressurized water therein to said drinking water basin and to said heater when said pump is deactivated and until said minimum pressure is reached whereupon said pump is re-activated,
said casing containing said preliminary filter means, said pump, said further filtering means, said auxiliary filter, said heater and said storage tank.

3. Apparatus as claimed in claim 2, wherein said further filtering means comprises a carbon filter and a reverse osmotic filter connected in sequence.

4. Apparatus as claimed in claim 3, comprising a waste water tube connected to said reverse osmotic filter for discharging separated waste water to a waste water outlet on said casing.

5. Apparatus as claimed in claim 2, comprising a pressure gauge connected between said carbon filter and said reverse osmotic filter.

6. Apparatus as claimed in claim 2, wherein said storage tank includes a flexible bag containing the pressurized water at a pressure between said maximum and minimum pressures.

7. Apparatus as claimed in claim 2, wherein said heater comprises a heating tank containing pressurized water, an electric heating element connected to said tank to heat the water therein, a temperature sensor for sensing temperature of the water in said heating tank and switch means for interrupting power supply to said heating element when the water temperature in said tank reaches a predetermined value, said apparatus further comprising a cooling fan in said casing.

8. Apparatus as claimed in claim 7, comprising a disinfector in said heating tank.