Oxygen permeable hard and semi-hard contact lens compositions, processes for their preparation, contact lenses and their manufacture from such compositions
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0067254A1
公开(公告)日:1982-12-22
The invention relates to novel monomers of polysiloxanyl alkyl esters of acrylic and methacrylic acids and its complymerization with alkyl esters of acrylic, methacrylic acids and/or itaconate esters to produce highly oxygen permeable contact lens material. The copolymer preferably. includes a cross-linking agent and hydrophilic monomer. Contact lenses manufactured from the material are easily machined and polished into hard or semi-hard contact lenses having excellent dimensional stability.
Polymers primarily for contact lenses, and contact lenses made from them
申请人:Tsuetaki, George F.
公开号:EP0080539A1
公开(公告)日:1983-06-08
The invention relates to new monomers of polysiloxanyl alkyl esters of acrylic and methacrylic acids and their copolymerization with alkyl esters of acrylic or methacrylic acids and/or itaconate esters to produce highly oxygen- permeable material primarily for contact lenses. The copolymer will include 10% to 60% of the silicon-containing monomer or monomers; preferred such monomers are tris(non amethyltetrasiloxanyl) methacryloxypropylsilane) or bis(decamethylpentasiloxanyl)di(methacryloxypropyl- methylsilane). The copolymer preferably includes a cross-linking agent and hydrophilic monomer. Contact lenses manufactured from the material are machined and polished into hard or semi-hard contact lenses having dimensional stability.
Interpenetrating polymer network hydrophilic hydrogels for contact lens
申请人:——
公开号:US20010044482A1
公开(公告)日:2001-11-22
An interpenetrating polymer network (IPN) composition and a process for the manufacture of hydrogel contact lens using the invention material. The polymeric materials are formed by polymerization of: (1) an unsaturated alkyl(meth)acrylate or its derivatives such as 2-hydroxyethyl methacrylate as the principle monomer; (2) optionally vinyl containing comonomer(s) to enhance the resulting hydrogel water absorbing capability; (3) polymerizable multi-functional crosslinking agent(s); (4) an irradiation initiator and/or thermal initiator; (5) optionally other additives to impart the resulting hydrogel specific properties such as ultra-violet blocking ability and handling colors; in the presence of a soluble, hydrophilic IPN agent such as polyvinylpyrrolidone (PVP) or poly-2-ethyl-2-oxazoline (PEOX) with a specific molecular weight range. The novel hydrophilic hydrogel material in the present invention can be used to produce a spherical contact lens, a toric contact lens, a multifocal contact lens, a toric-multifocal contact lens, and other medical devices. The inventive hydrogel material shows a low degree of surface friction, a low dehydration rate, and a high degree of biodeposit resistance.