摘要:
A novel organopolysiloxane compound having, in a molecule, at least one silyl-substituted ethyl group of the general formula ##STR1## in which R.sup.1 is a hydrogen atom or a methyl group, R is a monovalent hydrocarbon group and the subscripts a is 2 or and b is 1, 2 or 3, or a linear organopolysiloxane having, at each molecular chain end, at least one of such a group, can be prepared by first reacting a vinyl-containing organopolysiloxane with a hydrogen chlorosilane compound to effect the hydrosilation reaction between the silicon-bonded vinyl groups and the silicon-bonded hydrogen atoms and then the silicon-bonded chlorine atoms are subjected to a dehydrochlorination reaction with a silanol compound of the general formula ##STR2## A composition comprising the organopolysiloxane and a photopolymerization initiator is highly sensitive to light and readily cured into a rubbery elastomer by irradiation with ultraviolet light.
摘要:
Curable compositions comprising (A) an organopolysiloxane of the following general formula (1): ##STR1## wherein R.sup.1 is hydrogen or methyl, R.sup.2 and R.sup.3 are monovalent hydrocarbon groups, and R.sup.4 is a divalent organic group, (B) a silane having an .alpha.-silylester group, (C) a photoinitiator, and (D) a curing catalyst. The compositions are both photo-curable and room-temperature-curable. When cured by irradiation with light, the compositions give cured products having good rubber properties.
摘要:
The present process of producing a room temperature curable organopolysiloxane composition is characterized in that an organopolysiloxane represented by the following general formula (1) or (2): ##STR1## wherein X represents a hydrolyzable group such as an alkoxy group, R.sup.1 and R.sup.2 each represent a monovalent hydrocarbon group such as an alkyl group and a phenyl group, n is a positive integer, and a is 2 or 3, and a finely divided silica are mixed and thereafter a condensation catalyst is mixed. According to the present process, a curable composition which will not slump can be obtained without using a slump preventive.
摘要:
The photocurable organopolysiloxane composition is curable by irradiation with ultraviolet light into a rubbery elastomer which is excellently adhesive to the surface of the substrate on which it has been cured. The composition comprises an organopolysiloxane having, in a molecule, at least one acryloxy-functional group represented by the general formula[CH.sub.2 .dbd.CR.sup.1 --CO--O--(CH.sub.2).sub.a --SiR.sub.2 --O--].sub.b (R).sub.3-b Si--R.sup.2 --,in which R.sup.1 is a hydrogen atom or a methyl group, each R is a monovalent hydrocarbon group, R.sup.2 is an oxygen atom or a divalent hydrocarbon group and each of the subscripts a and b is 1, 2 or 3, as the principal ingredient together with an acryloxy-containing trialkoxy silane represented by the general formula(R.sup.3 O).sub.3 Si--R.sup.4 --(NH--CO--O--R.sup.4).sub.c --O--CO--CR.sup.1 .dbd.CH.sub.2,in which each R.sup.3 is a monovalent hydrocarbon group, each R.sup.4 is a divalent hydrocarbon group having 1 to 20 carbon atoms, R.sup.1 has the same meaning as defined above and the subscript c is zero or 1, acrylic or methacrylic acid and a photosensitizer.
摘要:
A photocurable organopolysiloxane composition comprising an organopolysiloxane having at least one photocurable acryloxyorganosilyl group in the molecule, a polyether-modified organopolysiloxane and a photo-initiator. The composition has good peelable protective properties after curing and heating, for example, in hot solder bath.
摘要:
A novel acrylic-functional organopolysiloxane is proposed which has a plural number of silicon-bonded (meth)acryloxyalkyl groups at each molecular chain end along with one or more of silicon-bonded alkoxy groups. The organopolysiloxane exhibits high curability by the irradiation with ultraviolet light or dual curability either by the ultraviolet irradiation or by the dealcoholation condensation reaction in a moisture-containing atmosphere. The acrylic-functional organopolysiloxane is prepared by the dealcoholation condensation reaction between a starting organopolysiloxane having a plural number of silicon-bonded alkoxy groups at each molecular chain end and a (meth)acryloxyalkyl dimethyl silanol compound in the presence of a specific condensation catalyst which is a divalent tin compound such as tin (II) dioctoate promoting the dealcoholation condensation but suppressing the silanol condensation reaction between the moleculaes of the (meth)acryloxyalkyl dimethyl silanol compound.
摘要:
Room temperature curable organopolysiloxane compositions (and the hardened products of such compositions) which comprise (A) a diorganopolysiloxane with hydroxyl groups at both ends, (B) a quaternary functional silane with four groups to be hydrolyzed and/or partially hydrolyzed products thereof, (C) a curing catalyst, (D) a filler, (E) a tertiary functional silane with three groups to be hydrolyzed and/or partially hydrolyzed products thereof and (F) an amine functional silane and/or an addition products with an acrylic acid ester or with a methacrylic acid ester show good adhesiveness towards surface-activated objects which has superior water-resistance.
摘要:
This invention enables the selective and easy manufacturing of acrylic organopolysiloxanes which are cured by the irradiation of UV light, by the reaction of the hydroxyl group containing organosilicon compounds (A) of formula (1): ##STR1## wherein each R.sup.1 independently is a substituted or an unsubstituted monovalent hydrocarbon group, and n designates integers from 1 to 10,000 with the acrylic group containing silane compounds (B) of formula (2): ##STR2## wherein each R.sup.2 and R.sup.3 independently is a substituted or an unsubstituted monovalent hydrocarbon group, R.sup.4 is either a hydrogen atom or a methyl group, and each of a and b is an integer from 1 to 3, in the presence of a divalent tin compound of formula (3):SnX.sub.2wherein each X independently is a halogen atom, alkoxy group, or a residue of a carboxyl group, in order to produce the acrylic organopolysiloxanes of formula (4): ##STR3## wherein R.sup.1 through R.sup.4, n, a and b are described as above.
摘要:
A condensation curable organopolysiloxane composition, capable of curing in the presence of moisture in air to become a rubber-like elastic material, comprising a compound having at least one carbon-bonded hydroxyimino group in its molecule. The composition is capable of inhibiting effectively, and for a long time, the propagation of any of a variety of fungi on the surface of a cured product of the composition.
摘要:
The ultraviolet-curable organopolysiloxane composition comprises (A) a first organopolysiloxane having, in a molecule, at least one isopropenyloxysilyl-substituted ethyl or propyl group, (B) a second organopolysiloxane having, in a molecule, at least 2 silicon-bonded mercaptoalkyl groups, (C) an organosilicon compound having at leaast one vinyl group in a molecule and (D) a photosensitizer. The composition can be rapidly cured by exposure to ultraviolet light into a cured silicone rubber body without the problems and disadvantages in the conventional ultraviolet-curable silicone rubber compositions.