摘要:
A process for preparing aqueous emulsions from high-molecular-weight organopolysiloxanes which are solid at room temperature, in the absence of organic solvents, which comprises dissolving the high-molecular-weight organopolysiloxane which is solid at room temperature in a low-molecular-weight organo(poly)siloxane which is liquid at room temperature, and emulsifying this solution with water in the presence of an emulsifier and other additives, if desired.
摘要:
The invention relates to organopolysiloxane compounds which can be stored subject to the exclusion of moisture, can be cross-linked by cleaving of alcohols to form elastomers when moisture gains access at room temperature and are based on (A) polydiorganosiloxanes with organyloxy groups, optionally (B) organyloxy functional cross-linkers with at least three organyloxy groups, and optionally (C) condensation catalysts, characterised in that they contain at least one (D) compound selected from the compounds (D.sub.a) to (D.sub.f) given in claim 1.
摘要:
A primer composition for silicone rubbers, in particular for addition-crosslinking silicone rubbers, comprises a tetraalkoxysilane and/or partial hydrolysate thereof, a metal salt, alkoxide, or chelate and/or partial hydrolysate thereof, a silicone resin, and from 50-95% by weight of solvent. The primer provides excellent adhesion between silicone rubber and numerous substrates.
摘要:
A primer composition for silicone rubbers, in particular for addition-crosslinking silicone rubbers, comprises a tetraalkoxysilane and/or partial hydrolysate thereof, a metal salt, alkoxide, or chelate and/or partial hydrolysate thereof, a silicone resin, and from 50-95% by weight of solvent. The primer provides excellent adhesion between silicone rubber and numerous substrates.
摘要:
The invention relates to organosilicon compounds with at least three silicon atoms, consisting of units of the formula (I) RaSi(NR1C═ONR22)k(NR3C═ONR4)t/2YmOn/2[(CR52)s]r/2, where Y represents units of the formula (II) —SiR63-p-q(NR1C═ONR22)p(NR3C═ONR4)q/2, where R, R1, R2, R3, R4, R5 and R6 independently of each other can be either identical or different and represent a hydrogen atom or possibly substituted monovalent hydrocarbon radicals with between 1 and 20 carbon atoms; and where a, k, t, n, m, r, s, p and q have the meaning assigned to them in claim 1, under the provision that the sum of p+q is ≦3, the sum of a+k+l+m+n+r equals 4, the sum of m+r equals 0 or 1, and the organosilicon compound of the invention contains at least one unit of formula (I) where t is not equal to 0.
摘要翻译:本发明涉及具有至少三个硅原子的有机硅化合物,由式(I)RaSi(NR1C = ONR22)k(NR3C = ONR4)t / 2YmOn / 2 [(CR52)s] r / 2的单元组成,其中 Y表示式(II)-SiR 63-pq(NR 1 C = ONR 22)p(NR 3 C = ONR 4)q / 2的单元,其中R,R 1,R 2,R 3,R 4,R 5和R 6彼此独立地可以相同 或不同的,表示氢原子或可能具有1至20个碳原子的取代的一价烃基; 并且其中a,k,t,n,m,r,s,p和q具有在权利要求1中分配给它们的含义,在p + q的和为<= 3的条件下,a + k的和 + 1 + m + n + r等于4,m + r的和等于0或1,本发明的有机硅化合物含有至少一个式(I)单元,其中t不等于0。
摘要:
The present invention relates to gypsum powders containing a hydrophobic agent and to water-repellent articles which are prepared from gypsum containing powered hydrophobic agents, in which the hydropohobic agents are prepared by spray-drying a mixture containing at least water, an organopolysiloxane having Si-bonded hydrogen and a water-soluble, film-forming polymer having a turbidity point of from 35.degree. to 98.degree. C.