Hydrogel based on copolymers containing silicone
A technology of hydrogel and copolymer, applied in the field of new hydrogel, can solve the problems of expensive economic point of view
Inactive Publication Date: 2011-04-20
EVONIK ROEHM GMBH
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Problems solved by technology
[0008] However, materials known from the prior art often still require further improvement or are too expensive from an economic point of view
Method used
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[0082] As a random copolymerization form, tert-butylperoxy-2-ethylhexanoate (V 69) was used as initiator, polymerization was carried out in bulk at 80° C. for 2 h (Examples 1-9, 12+13). In Examples 10 and 11, polymerization was carried out similarly, but in the presence of pentanol (monomer / pentanol=60:40 (v:v)).
[0083] The silicone-containing monomer b) used was methacryloxypropyltris(trimethylsiloxy)silane (TRIS); the vinyl monomer a) used was methyl-(2 -Methoxy-2-methyl-1,3-dioxolan-4-yl)methacrylate (MMDMA), methyl-(2-methoxy-2-methyl-1,3- Dioxolan-4-yl) acrylate (MDMA) or 2,3-O-isopropylideneglyceryl methacrylate (IPGMA).
[0084] The crosslinker d) used is ethylene glycol dimethacrylate (EGDMA) and, optionally, the additional hydrophilic monomer c) used is hydroxyethyl methacrylate (HEMA) and / or Methacrylic acid (MAS).
[0085] Table 1. Monomer Mixture
[0086]
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The invention relates to a hydrogel that is a copolymer of a polymerizable monomer mixture which contains a) 10-65 mole percent of at least one hydrophobic vinyl monomer of formula (I), where R1 represents hydrogen or methyl, p is an integer ranging from 1 to 8, and in which the hydroxy groups are provided in a protected form, b) 25-70 mole percent of at least one (meth)acrylate, vinyl carbonate, or vinyl carbamate monomer containing silicone, c) 0-25 mole percent of at least one hydrophilic vinyl monomer, and d) 0-10 mole percent of at least one cross-linking agent relative to the total amount of monomers a) to c). The hydroxy groups of the segments formed by monomers a) are provided in a protected or free form in the hydrogel. Said hydrogel can be used for producing contact lenses or intraocular lenses.
Description
technical field [0001] The present invention relates to novel hydrogels based on silicone-containing copolymers, a process for their preparation and their use as contact lens material or intraocular lens material. Background technique [0002] For many years there has been a strong demand for contact lenses made of materials with high oxygen permeability and good compatibility with the eye even under prolonged wear conditions. [0003] It is well known that hydrogels (crosslinked polymers with limited swellability in water) have oxygen permeability which depends on the water content. It increases with increasing water content. It is also known that polymers containing fluorine structural units and those based on polysiloxanes exhibit particularly high oxygen permeability. However, polymers consisting entirely or predominantly of the latter two classes have low water contents. In the case of known polymers, the high oxygen permeability desired in principle is generally ach...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G02B1/04G02C7/04C08F230/08C08L33/06
CPCC08F222/1006C08F220/28C08F230/08G02B1/043C08F222/102C08F220/282C08F230/085C08L83/04C08L51/085C08L69/00
Inventor C·布雷纳M·奥梅斯
Owner EVONIK ROEHM GMBH