摘要:
A process of preparing rigid polyurethane foams is disclosed, wherein polysiloxane polyoxyalkylene block copolymers which have at least one aminofunctional group of the general formula, ##STR1## which is linked to a silicon atom, are used in an amount of 0.2 to 5% by weight, based on the polyol or the prepolymer having isocyanate groups, to provide polyurethane foams, which otherwise contain closed cells, with at least partially open the cells.
摘要:
In a method for the preparation of highly elastic, cold curing polyurethane foams, equilibrated organofunctional polysiloxanes of the average general formula ##STR1## wherein R.sup.1 is methyl or R.sup.2,R.sup.2 is chloropropyl,n has a value of 0 to 12,m has a value of 1 to 8 when R.sup.1 is methyl and a value of 0 to 6 when R.sup.1 is chloropropyl,are added in amounts of 0.01 to 2.0% by weight, based on the polyols, to the reaction batch.The stabilizing properties of the organofunctional polysiloxanes are superior to those of the known products. The foams, produced pursuant to the invention, have a coarser cell structure and a higher elasticity. The foams are more open-celled as measured by the impression force.
摘要:
In a process for the preparation of molded polyurethane or polyurea articles, especially by the RIM process, internal release agents of the general formula ##STR1## are used. In this formula R.sup.1 =is alkyl with 20 to 40 carbon atoms,R.sup.2 =is R.sup.1 or methyl,R.sup.3 =is --(CH.sub.2).sub.s -- or --[(CH.sub.2).sub.t --].sub.r (OC.sub.2 H.sub.4).sub.x --(OC.sub.3 H.sub.6).sub.y --whereins=3 to 12,t=3 to 12,r=0 or 1,x=0 to 10,y=0 to 10,and the sum of x+y is not less than 1,n=0 to 50,m=2 to 100, m being greater than n,p=0 to 5,with the proviso that the siloxane has a melting point of not less than 38.degree. C.The compounds are finely dispersed with an average particle size of not less than 5 to 100.mu. in amounts of 0.5 to 5 weight percent, based on the reaction formulation. The release agents are preferably suspended in a portion of the polyol or polyolamine that is to be foamed.The release agents exhibit outstanding release properties and, in the event that molded polyurethane or polyurea articles with a cellular core are prepared, do not prevent the development and/or the maintenance of the cellular structure.
摘要:
Process for the preparation of flexible polyurethane foams using polysiloxane-polyoxyalkylene block copolymers as stabilizers having the general formula: ##STR1## in which A represents A.sup.1 and A.sup.2 polyoxyalkylene blocks, as defined hereinafter, which are linked to silicon over carbon and which have the general formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R.sup.2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms and R.sup.3, x and y are as defined hereinafter,B is a methyl radical, the A or R.sup.1 radical,R.sup.1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkaryl radical,n has a value of 30 to 200,m has a value of 3 to 20 when B is a methyl radical or corresponds to the R.sup.1 radical, and a value of 1 to 18 when B corresponds to the A radical,o has a value of 0 to 40, n being not less than 5 m, and m and o being not greater than 1/3 n,with the proviso that(a) the A.sup.1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R.sup.3 radical is a hydrogen radical and the average molecular weight of the A.sup.1 Blocks is from 2,500 to 4,500,(b) the A.sup.2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R.sup.3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical, and the average molecular weight of the A.sup.2 blocks is from 800 to 2,400, and(c) the molar ratio of the A.sup.1 blocks to the A.sup.2 blocks is 20:80 to 60:40, and there is at least one A.sup.1 and one A.sup.2 block in the average molecule.The stabilizers are distinguished by exceptionally high stabilizing properties and, when used in flexible polyurethane foams, surprisingly form open cells in spite of the fact that they contain OH-terminated polyoxyalkylene blocks.
摘要:
Organopolysiloxanes that have betaine groups and the following general formula ##STR1## in which R.sup.1 can represent the same or different groups in the molecule and may be an alkyl radical with 1 to 18 carbon atoms, an aryl radical or a polyoxyalkylene radical with the proviso that at least 70% of the R.sup.1 radicals are methyl radicals,R.sup.2 may be the same as R.sup.1, with the proviso that at least one R.sup.2 radical represents ##STR2## in which R.sup.3 is a divalent alkylene radical with 2 to 12 carbon atoms,R.sup.4 is a divalent alkylene radical with 2 to 6 carbon atoms,R.sup.5 and R.sup.6 are the same or different and represent an alkyl radical with 1 to 4 carbon atoms or a benzyl radical, andn=1, 2, or 3,x has a value of 0 to 200, andy has a value of 1 to 50, as well as processes for their synthesis and their use in cosmetic preparations, especially in hair care products.
摘要:
In a process for producing rigid polyurethane foams, polysiloxane-polyoxyalkylene block copolymers having the formula ##STR1## are used, in which A represents polyoxyalkylene blocks A.sup.1 or A.sup.2 having the formula --R.sup.2 --O--(C.sub.m H.sub.2m O).sub.y R.sup.1, which are linked to silicon by an SiC bond and in which R.sup.1 represents a hydrogen atom or an alkyl radical with 1 to 4 carbon atoms, R.sup.2 represents a bridging group, y is a whole number, and m has a value of 2.0 to 2.6, with the proviso that:a. the A.sup.1 blocks comprise 70 to 100 weight percent oxyethylene units, the remainder being oxypropylene units, and have a molecular weight from about 250 to 1,000,b. the A.sup.2 blocks comprise 35 to 65 weight percent oxyethylene units, the remainder being oxypropylene units, and have a molecular weight from about 600 to 1,500,c. the molar ratio of the A.sup.1 block to the A.sup.2 blocks is 85:15 to 15:85 and there is at least one block of A.sup.1 and block of A.sup.2 in the average molecule;B is a methyl radical or an A.sup.1 or A.sup.2 polyoxyalkylene block;a has a value of 15 to 150, andb has a value of 5 to 20, when B is a methyl radical, and a value of 3 to 18, when B represents A.sup.1 or A.sup.2.
摘要翻译:在制造刚性聚氨酯泡沫体的方法中,使用具有式(I)的聚硅氧烷 - 聚氧化烯嵌段共聚物,其中A表示具有式-R 2 -O-(C m H 2 m O)y R 1的聚氧化烯嵌段A 1或A 2,其与 硅,其中R1表示氢原子或具有1至4个碳原子的烷基,R2表示桥连基团,y表示整数,m表示2.0至2.6的值,条件是 : 一个。 所述A1嵌段包含70至100重量%的氧化乙烯单元,其余为氧化丙烯单元,分子量为约250至1,000,b。 A2嵌段包含35至65重量%的氧化乙烯单元,其余为氧化丙烯单元,分子量为约600至1500,c。 A1嵌段与A2嵌段的摩尔比为85:15〜15:85,在平均分子中存在至少一个A1嵌段和A2嵌段; B是甲基或A1或A2聚氧化烯嵌段; a的值为15〜150,当B为甲基时,b为5〜20,B为A1或A2时为3〜18。
摘要:
The invention relates to the use of copolymers of the average formula ##STR1## in which R is an alkyl radical with 1 to 4 carbon atoms or a hydrogen radical;n=10 to 200;m=1 to 25;o=1 to 100 with the proviso that o is not less than m, and 3 o is less than n in the average molecule;p=7 to 17; andwherein the molecular weight of the (C.sub.2 H.sub.4 O--).sub.x (C.sub.3 H.sub.6 O--).sub.y R radical is 250 to 2,000 with x and y being selected so that the weight ratio of oxyethylene to oxypropylene is 100:0 to 20:80, as emulsifiers for the preparation of W/O emulsions, whose oily phase consists of or contains silicone oil.
摘要翻译:本发明涉及平均式为“IMAGE”> + TR< IMAGE>的共聚物的用途,其中R为具有1至4个碳原子的烷基或氢原子; n = 10〜200; m = 1〜25; o = 1至100,条件是o不小于m,平均分子中3 o小于n; p = 7〜17; 并且其中(C2H4O-)x(C3H6O-)yR基团的分子量为250至2,000,其中选择x和y,使得氧乙烯与氧丙烯的重量比为100:0至20:80,作为 W / O乳液的制备,其油相由硅油组成或含有硅油。
摘要:
Organopolysiloxanes that have betaine groups and are of the general formula ##STR1## in which R.sup.1 can represent the same or different groups in the molecule and may be an alkyl radical with 1 to 18 carbon atoms, an aryl radical or a polyoxyalkylene radical with the proviso that at least 70% of the R.sup.1 radicals are methyl radicals,R.sup.2 may be the same as R.sup.1, with the proviso that at least one R.sup.2 radical represents the ##STR2## in which R.sup.3 and R.sup.4 are different, one radical representing a hydroxyl group, and the other the ##STR3## in which R.sup.5 and R.sup.6 are the same or different and represent an alkyl radical with 1 to 4 carbon atoms or a benzyl radical, and n=1, 2, or 3,x has a value of 0 to 200, andy has a value of 1 to 50,as well as processes for their synthesis and their use in cosmetic preparations.
摘要:
The invention relates to a process for the manufacture of highly resilient, cold-curing polyurethane foams with the distinctive feature that polysiloxane-polyoxyalkylene block copolymers with the following characteristics are used as foam stabilizers:(a) the polysiloxane block is linear or branched and contains an average of 4 to 25 silicon atoms, wherein the organic radicals linked to the silicon atoms are polyoxyalkylene or methyl radicals and up to 30% of the methyl radicals can be replaced by substituted alkyl radicals with 1 to 4 carbon atoms, and/or phenyl radicals, and mixtures thereof;(b) the polyoxyalkylene portion consists of at least two polyoxyalkylene blocks, A.sub.1 and A.sub.2, which are formed from oxyethylene and oxypropylene units, wherein block A.sub.1 is formed from 45 to 100 mole percent of oxyethylene units and 55 to 0 mole percent of oxypropylene units and block A.sub.2 is formed from 0 to 50 mole percent of oxyethylene units and 100 to 50 mole percent of oxypropylene units, the molecular weight of the polyoxyalkylene blocks A.sub.1 and A.sub.2 in each case being 150 to 1,200 and the molar ratio of blocks A.sub.1 :A.sub.2 falling in the range of 20:80 to 80:20; and(c) the polysiloxane block is linked to the polyoxyalkylene blocks by SiOC or SiC bridges, 1.5 to 10 polyoxyalkylene blocks being linked to each polysiloxane block on the average.The stabilizers have improved stabilizing properties and form open-cell foams at a relatively wide processing latitude.
摘要:
In a process for the addition of silanes or siloxanes having SiH groups to compounds with olefinic double bonds, the invention relates to the use of catalysts of the general formulaYX.sub.2 (NH.sub.3).sub.2in which Y is a platinum or palladium radical, andX is a chlorine, bromine or iodine radical or the NO.sub.2 group.The catalysts have a high selectivity. Side reactions and disproportionation reactions are avoided.