Oxygen permeable soft contact lens composition

• US 4,525,563 A
• Filed: 03/13/1984
• Issued: 06/25/1985
• Est. Priority Date: 04/06/1983
• Status: Expired due to Term

• Current Assignee: Menicon Company Limited, Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited, Toyo Contact Lens Co., Ltd.
• Inventors: Shibata, Takanori, Ichinohe, Shoji, Isobe, Kenichi, Yoshikawa, Toshiharu
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/589,251
• Time in Patent Office: 469 Days
• Field of Search: 526/279, 526/264, 526/245
• US Class Current: 526/279
• CPC Class Codes: C08F 230/08 containing silicon
• CPC Class Codes: C08L 43/04 Homopolymers or copolymers of monomers containing silicon
• CPC Class Codes: G02B 1/043 Contact lenses

Abstract

A copolymer comprising,

(a) a hydrophilic siloxanylalkyl ester having a structure in which a siloxane part (1) having a terminal acryloyl or methacryloyl group and a siloxane part (2) having a terminal hydrophilic group are bonded through an alkylene chain with each other,

(b) a hydrophilic monomer, and

(c) a hydrophobic monomer

is suitable for use in the production of a soft contact lens having a high oxygen permeability and an excellent affinity for the eye tissue which can be worn continuously for a long period of time.

Claims

1. A copolymer suitable for use in the production of an oxygen permeable soft contact lens, comprising a copolymer of the following monomers:

(a) a hydrophilic siloxanylalkyl ester having the formula (I);

##STR29## wherein R¹ is hydrogen atom or methyl group, R² is methyl group or --OSi(CH₃)₃, R³ is a hydrophilic group selected from the group consisting of an oligo ether residue, a diol residue, an aminohydrin residue and an acid amido residue, n is an integer of 1 to 4, m and l are 0 or an integer of 1 to 2, and k is an integer of 2 to 4, or an admixture thereof,

(b) a hydrophilic monomer other than said monomer (a), and

(c) a hydrophobic monomer.

2. The copolymer suitable for use in the production of an oxygen permeable soft contact lens of claim 1, wherein the substituent group defined as R³ in the formula (I) is a hydrophilic group selected from the group consisting of an oligo ether residue having the formula:

space="preserve" listing-type="equation">--(CH.sub.2).sub.3 O(CH.sub.2 CH.sub.2 O).sub.x --R.sup.4

wherein x is 0 or an integer of 1 to 5 and R⁴ is hydrogen atom or an alkyl group having 1 to 4 carbon atoms;

a diol residue having the formula;

##STR30## wherein y is an integer of 1 to 3;

an aminohydrin residue having the formula;

##STR31## wherein R⁵ and R⁶ are the same or different, and each is hydrogen atom or an alkyl group having 1 to 4 carbon atoms;

an aminohydrin residue having the formula;

##STR32## wherein a is an integer of 4 to 7;

an acid amido residue having the formula;

##STR33## wherein R⁷ and R⁸ are the same or different and each is hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and

an acid amido residue having the formula;

##STR34## wherein b is an integer of 4 to 7.