摘要:
A composite polymeric material having a high permeability to oxygen is proposed comprising a vinyl chloride moiety, an organosilicon moiety and, optionally, a third polymeric moiety. Such a composite polymeric material can be prepared in several ways including copolymerization of vinyl chloride monomer, a polymerizable organosilicon compound and, optionally, a third monomer, graft-polymerization of a polymerizable organosilicon compound on to a polyvinyl chloride resin, graft-polymerization of vinyl chloride on to an organopolysiloxane, graft-copolymerization of vinyl chloride and a polymerizable organosilicon compound on to a third polymer and blending of the respective polymeric components.
摘要:
A water soluble water absorption preventing agent mainly comprising an organic silicon compound and/or its partial hydrolytic condensate, represented by the following general formula: ##STR1## wherein R.sup.1 denotes an alkyl group with 1-20 carbon atoms and with a linear chain or branched chain for which a halogen can substitute for part or all of the hydrogen atoms, R.sup.2 denotes a hydrogen atom or an alkyl group with 1-10 carbon atoms and with a linear chain or branched chain, R.sup.3 denotes a hydrogen atom or an alkyl group with 1-8 carbon atoms and with a linear chain or branched chain, m denotes an integer 1-2 and n denotes an integer 1-3 where m+n=3 or 4, p denotes an integer 1-50, and q denotes an integer 0-25.
摘要翻译:一种主要包含有机硅化合物和/或其部分水解缩合物的水溶性吸水防止剂,由以下通式表示:其中R1表示具有1-20个碳原子的直链或支链的烷基 卤素可以代替部分或全部氢原子的链,R2表示氢原子或具有1-10个碳原子的直链或支链的烷基,R3表示氢原子或具有 1-8个碳原子并且具有直链或支链,m表示整数1-2,n表示整数1-3,其中m + n = 3或4,p表示1-50的整数,q表示 整数0-25。
摘要:
An oxygen permeable hard contact lens having an improved oxygen permeability and an improved hardness and rigidity and an improved refractive index, made of a polymer comprising a styrene containing a silyl or siloxanyl group having at most 15 silicon atoms.
摘要:
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 monomeris 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.
摘要:
A highly volatile electrical/electronic parts surfactant containing a polyether-modified silicone having one polyether chain in the molecule, wherein the surface tension at 25° C. of a 0.01 mass % aqueous solution thereof is 25 mN/m or less, the aforesaid silicone is expressed by the following average structural formula (1), and when heated from room temperature to 200° C. at a rate of 5° C./minute to 200° C. and maintained at a temperature of 200° C. for 100 minutes, the polyether-modified silicone completely volatilizes without leaving any remainder, and a method of manufacturing this highly volatile polyether-modified silicone are disclosed. AMe2SiO(MeASiO)nSiMe2A (1) In formula (1), any one of A is a substituent group expressed by the following general formula (2), the remaining A are methyl groups and n is an integer from 0-2. —CaH2aO(C2H4O)bR (2) In formula (2), a is 3-4, b is an integer from 1-7 and R is a methyl group or an ethyl group.
摘要:
A process for preparing an urethane compound for medical instruments, characterized by reacting a hydroxyl compound (A) with an isocyanate compound (B) in the absence of a catalyst or in the presence of a reaction catalyst other than an organic tin compound to give an urethane compound (I). According to the process, the urethane compound showing high safety can be easily prepared, in particular, while molecular weight of the compound is controlled.
摘要:
Polysulfide silanes: (RO).sub.3 SiC.sub.3 H.sub.6 S.sub.x C.sub.3 H.sub.6 Si(OR).sub.3 are reacted with an anhydrous sulfur compound: M.sup.1.sub.2 S or M.sup.2 S and a halogenoalkoxysilane: XC.sub.3 H.sub.6 Si(OR).sub.3 to form polysulfide silanes: (RO).sub.3 SiC.sub.3 H.sub.6 S.sub.y C.sub.3 H.sub.6 Si(OR).sub.3 wherein R is methyl or ethyl, x is a positive number of 3 to 6 on the average, M.sup.1 is an alkali metal or ammonium, M.sup.2 is an alkaline earth metal or zinc, X is a halogen, and y is a positive number less than x on the average. Short chain polysulfide silanes can be prepared with the industrial advantages of safety, high yields and low cost.
摘要翻译:将多硫化硅烷:(RO)3SiC 3 H 6 S x C 3 H 6 Si(OR)3与无水硫化合物:M12S或M2S和卤代烷氧基硅烷:XC3H6Si(OR)3反应形成多硫化硅烷:(RO)3SiC 3 H 6 S 3 C 6 H 6 Si(OR)3,其中R为甲基或乙基 x是平均为3〜6的正数,M1为碱金属或铵,M2为碱土金属或锌,X为卤素,y为平均小于x的正数。 短链多硫硅烷可以安全,高产率,低成本的工业优点制备。
摘要:
A surface treating agent comprising a reaction product of (A) a fluoroalkyl group-containing alkoxysilane with (B) an amino group-containing alkoxysilane and optionally further with (C) an alkyl group-containing alkoxysilane is water soluble. The agent is diluted with water to form a solution for treating glass and other substrates to impart durable water repellency and other improved properties to the substrates.
摘要:
A soft ocular lens material prepared by copolymerizing copolymer components consisting essentially of:(A) from 5 to 70 parts by weight of a fluorine-containing (meth)acrylate;(B) from 5 to 60 parts by weight of an alkoxy-containing (meth)acrylate;(C) from 3 to 45 parts by weight of a polysiloxane macromonomer having polymerizable groups at both terminals, of the formula I: ##STR1## (D) from 3 to 40 parts by weight of a polysiloxane macromonomer having polymerizable groups bonded via one or two urethane bonds to the siloxane main chain, of the formula II: ##STR2##