| 摘要 |
The invention comprises wetting agents which are siloxanes composed of only (a) one group of formula <FORM:1121831/C3/1> and (b) from 1 to 4 groups of formula <FORM:1121831/C3/2> where a is 0 to 2, b is 2 or 3, R is methyl or ethyl, R1 is an alkyl group of 1 to 4 carbon atoms, m is 3 or 4, n is 3.8 to 17, p is 0 to 5, the ratio of n to p is at least 2 to 1, (n+p) is 4 to 17, and the polyethyleneoxy group is attached to the silicon atom by at least 3 carbon atoms of CmH2m. Mixtures of up to 2 parts by weight of the siloxane with 100 parts of water and emulsions of from 10 to 50 parts of the siloxane and from 0.1 to 5 parts of a silicone oil of formula R311SiO(R112SiO)xSiR311 with 100 parts of water are formed, where R11 is a hydrocarbyl group and x is 10 to 1000. R11 is typically an alkenyl, cycloalkenyl, alkyl, aryl, aralkyl, alkaryl, or cycloalkyl group. The siloxanes are prepared by the reaction of a hydrosiloxane (containing Si-H) and an alkenyl ether of an alkoxy and hydroxy end-blocked poly(ethylene oxide) at 85 DEG C. to 110 DEG C., in the presence of a platinum catalyst and a solvent. In Example I the siloxane (Me3SiO)2Si(Me)C3H6 (OC2H4)7.2OMe is prepared. In Example XII, various pairs of reactants to produce the siloxanes are given. Comparisons are made with siloxanes containing up to 37 of the above (a) groups and having n less than 4. Uses.-Additives for aqueous paints, adhesive compositions, printing inks, dyeing baths, and mould release compositions to improve their wetting properties. Reference has been directed by the Comptroller to Specification 802,467. |
