摘要:
Polyorganopolysiloxane/polyoxyalkylene block compolymers suitable for use as stabilizers in making soft polyurethane foams, of the formula[R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2in whichR is an optionally halogen-substituted alkyl group with up to 4 C atoms,R.sup.1 is the substituent R or a phenyl radical,R.sup.2 is an aliphatic, optionally unsaturated radical with up to 18 C atoms or a group of the formulaR.sup.3 (OCH.sub.2 CH.sub.2).sub.x (OCH.sub.2 CH).sub.y -,Z is the difunctional unit --O-- or ##STR1## R.sup.3 is a hydrocarbon radical with up to 4C atoms, R.sup.4 each independently is a hydrogen atom or R.sup.3,n is from 3 to 30,m is from 1 to 15,x is from 0 to 68,y is from 0 to 52,x+y is from 1 to 68, andP is from 2 to 12,are produced by reacting an organopolysiloxane of the formulaR.sup.1 Si(OSiR.sub.2).sub.n U.sub.3-a-b Cl.sub.a W.sub.bin whichU is a radical of a lower monobasic carboxylic acid with up to 4 C atoms,W is a radical of a fluorinated alkanesulphonic acid,a.ltoreq.1, andb.ltoreq.0,5,with a mixture of R.sup.2 OH and H-Z-H, in the presence of a base in an organic solvent, the relative proportion of the reactants being determined by the value of m.
摘要:
Polyorganopolysiloxane/polyoxyalkylene block copolymers suitable for use as stabilizers in making soft polyurethane foams, of the formula[R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2in whichR is an optionally halogen-substituted alkyl group with up to 4 C atoms,R.sup.1 is the substituent R or a phenyl radical,R.sup.2 is an aliphatic, optionally unsaturated radical with up to 18 C atoms or a group of the formulaR.sup.3 (OCH.sub.2 CH.sub.2).sub.x (OCH.sub.2 CH).sub.y --,Z is the difunctional unit --O-- or ##STR1## R.sup.3 is a hydrocarbon radical with up to 4C atoms, R.sup.4 each independently is a hydrogen atom or R.sup.3,n is from 3 to 30,m is from 1 to 15,x is from 0 to 68,y is from 0 to 52,x+y is from 1 to 68, andp is from 2 to 12,are produced by reacting an organopolysiloxane of the formulaR.sup.1 Si(OSiR.sub.2).sub.n U.sub.3-a-b Cl.sub.a W.sub.bin whichU is a radical of a lower monobasic carboxylic acid with up to 4 C atoms,W is a radical of a fluorinated alkanesulphonic acid,a.ltoreq.1, andb.ltoreq.0,5,with a mixture of R.sup.2 OH and H-Z-H, in the presence of a base in an organic solvent, the relative proportion of the reactants being determined by the value of m.
摘要翻译:适合用作制备软质聚氨酯泡沫的稳定剂的聚有机聚硅氧烷/聚氧化烯嵌段共聚物,式[R1Si(OSiR2)n] mZm-1(OR2)m +2,其中R是任选卤素取代的烷基,最多达4个 C原子,R 1是取代基R或苯基,R 2是具有至多18个C原子的脂肪族,任选的不饱和基团或式R3(OCH2CH2)x(OCH2CH)y-的基团,Z是双官能单元 - O-或 R3是具有至多4C原子的烃基,R4各自独立地为氢原子或R3,n为3至30,m为1至15,x为0至68,y为 0至52,x + y为1至68,p为2至12,通过使式R 1 Si(OSiR 2)n U 3-a-b Cl a W b的有机聚硅氧烷(其中U为低级单碱基 具有至多4个C原子的羧酸,W是氟化烷基磺酸的基团,其中R 1 OH和HZH的混合物在碱存在下在 有机溶剂, 反应物的相对比例由m值决定。
摘要:
In a sheet coated on both surfaces with non-stick coatings, one of the coatings being more non-stick than the other, the improvement which comprises employing as the lesser non-stick coating a composition according to claim 1 by weight consisting essentially of(A) about 10 parts of a polyorganosiloxane with hydroxyl end groups and with a viscosity of 10.sup.2 to 5.10.sup.4 Pas,(B) 0.5-5 parts of at least one cross-linking agent of the formulaRSiX.sub.3whereinX is a hydrolyzable group andR is an alkyl, alkenyl, aryl or aminoalkyl group with 1-12 C atoms,(C) 0.1-2 parts of an organic tin compound as the catalyst and(D) 100-500 parts by weight of an organic solvent, the improvement which comprises additionally including, and(E) 0.1-20 parts of a graft copolymer comprising(i) 25-75% of an essentially linear polyorganosiloxane with hydroxyl end groups and with a viscosity of 100 to 500,000 mPas and(ii) 10-70% of at least one organic polymer with a molecular weight of 500 to 100,000, linked to (i) via bridges formed on polymerization of(iii) 10-60% of one or more monomers containing at least one aliphatic double bond.
摘要:
A chlorosilane or partial hydrolysis product thereof is reacted with a siloxane and stable polymeric products of comparatively high molecular weight or high chlorine content are produced by effecting the reaction in the presence of a siloxane protonic acid equilibration catalyst in combination with a hydrogen halide acid. The hydrogen halide acid may be produced in situ. Representative protic acid equilibration catalysts include sulfuric acid, oleum, polysulfuric acids, sulfonic acids including aromatic, alkyl and perfluoroalkyl sulfonic acids, and polysulfonic acids.
摘要:
In the preparation of multi-branched equilibrated mixed acyloxy-containing and chlorine-containing organo polysiloxanes by reacting a chlorosilane of the formulaR.sub.a SiCl.sub.4-awhereina=0 or 1,with at least one organosiloxane containing units of the formulaR.sub.2 R'SiO.sub.1/2, RR'SiO, R'SiO.sub.3/2 and/or SiO.sub.2whereinR is hydrogen or an aliphatic, aromatic, saturated or unsaturated, optionally halogen-substituted or cyano-substituted monovalent hydrocarbon radical with up to 8 C atoms andR' is chlorine, hydroxyl, hydrogen or an aliphatic, aromatic, saturated or unsaturated, optionally halogen-substituted or cyano-substituted monovalent hydrocarbon radical with up to 8 C atoms,in proportions such that the number of all the SiCl groups is always at least 1.5 times greater than the number of SiOH groups, in the presence of (a) fluoroalkanesulphonic acid or salt thereof and (b) relative to the chlorine atoms bonded to silicon, at least 1.1 times the molar amount of a concentrated monobasic carboxylic acid, the improvement which comprises adding a portion of the carboxylic acid in a first stage, and in a second stage adding the balance of the carboxylic acid along with water in the amount required to achieve the desired degree of branching. Advantageously the fluoroalkanesulphonic acid is a perfluoroalkanesulphonic acid containing up to 8 carbon atoms, and it or its salt is employed in about 0.05 to 1.5% by weight of chlorosilane plus organosilane, the carboxylic acid is acetic acid, the reaction is carried out at a temperature up to about 135.degree. C., the organosilane comprises a cyclosiloxane of the formula(RR'.dbd.SiO).sub.3-5,and about half the acetic acid is added in each stage.
摘要:
Polyurethane is present as a solid phase in a liquid polyorganosiloxane, preferably being formed therein by mixing a polyhydroxy-containing material with the polysiloxane followed by addition of a polyisocyanate. If the polyorganosiloxane contains hydroxyl groups it can be chemically bonded to the polyurethane. The composition can be cured to solid plastic masses of superior properties by adding a curing agent for the polysiloxane.
摘要:
A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to 135.degree. C. a chlorosilane of the formulaR.sub.a R'.sub.b SiCl.sub.(4-a-b)whereina=0, 1, 2 or 3b=0, 1, 2 or 3, anda+b is at most 3,or a partial hydrolysis product thereof, with at least one organosiloxane containing the units[R.sub.2 R"--SiO.sub.178 ] [RR"--SiO] [R"--SiO.sub.3/2 ] [SiO.sub.2 ]whereinR and R' each independently is hydrogen or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, andR" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms,in the presence of a proton acid siloxane-equilibration catalyst, and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si--Cl groups in the reactants exceeding the number of all the Si--OH groups.
摘要:
A process for the recovery by distillation of tributyl phosphate (TBPO) from spent hydraulic oils, which are employed particularly in aircraft used for civilian air traffic.
摘要:
Novel mixtures containing at least one polysiloxane and at least one reactive filler, at least one pigment and/or unreactive filler and optionally other additives, their preparation and use in coating. Preferably they are largely free of organic polymers.