Method of making organosiloxane resins

Claim 1

A method of making organosiloxane resins of the general formula (M x T y Q z ] n wherein M denotes a monofunctional siloxane unit of the general formula R 3 SiO½, T denotes a trifunctional siloxane unit of the general formula RSiO 3/2 and Q denotes a tetrafunctional unit of the general formula SiO 4/2 , which comprises (I) adding together (A) a silane of the general formula SiZ 4 , (B) a silane of the general formula RSiY 3 and (C) a silane of the formula R 3 SiX or (C') a disiloxane of the formula (R 3 Si) 2 0 in an aqueous medium, and (II) allowing Components (A), (B) and (C) or (C') to react together in said aqueous medium, the medium having a pH below 7, characterised in that the organosiloxane resins are liquid at 50° C at a pressure of 10 5 Pa, in that n has an average value of from 4 to 14, x, y and z have values such that x + y is not less than z and not more than 2z and the ratio of x to y has a value of from 2 to 9, in that R represents an aliphatic or aromatic hydrocarbon substituent, hydrogen, a substituted hydrocarbon group or an organic group linked to silicon via a carbon atom and having O and/or P or S atoms present, in that z molar parts of Component (A), y molar parts of Component (B) and either x molar parts of Component (C) or x/2 molar parts of Component (C') are used, in that X denotes a halogen or alkoxy group, Y denotes X or a group of the general formula -OSiR' 3 , wherein R' denotes an alkyl group or an aryl group and Z denotes an alkoxy group and in that Component (A) is not added to the aqueous medium prior to Components (B) and (C) or (C

Claim 2

A method of making organosiloxane resins of the general formula (M x T y Q z ] n wherein M denotes a monofunctional siloxane unit of the general formula R 3 SiO½, T denotes a trifunctional siloxane unit of the general formula RSiO 3/2 and Q denotes a tetrafunctional unit of the general formula SiO 4/2 , which comprises (I) adding together (A) a silane of the general formula SiZ 4 , (B) a silane of the general formula RSiY 3 and (C) a silane of the formula R 3 SiX or (C') a disiloxane of the formula (R 3 Si) 2 0 in an aqueous medium, and (II) allowing Components (A), (B) and (C) or (C') to react together in said aqueous medium, the medium having a pH below 7, characterised in that the organosiloxane resins are liquid at 50° C at a pressure of 10 5 Pa, in that n has an average value of from 4 to 14, x, y and z have values such that x + y is not less than z and not more than 2z and the ratio of x to y has a value of from 2 to 9, in that R represents an aliphatic or aromatic hydrocarbon substituent, hydrogen, a substituted hydrocarbon group or an organic group linked to silicon via a carbon atom and having O and/or P or S atoms present, in that z molar parts of Component (A), y molar parts of Component (B) and either x molar parts of Component (C) or x/2 molar parts of Component (C') are used, in that X denotes a halogen or alkoxy group, Y denotes X or a group of the general formula -OSiR' 3 , wherein R' denotes an alkyl group or an aryl group and Z denotes an alkoxy group and in that Component (A) is not added to the aqueous medium prior to Components (B) and (C) or (C

Claim 6

A method according to any one of the preceding claims characterised in that the ratio of x over y is from 3/1 to 5/1.

Claim 7

A method according to any one of the preceding claims characterised in that Z in Component (A) is an alkoxy group with 2 to 4 carbon atoms.

Claim 8

A method according to any one of the preceding claims characterised in that in Component (B) R is hydrogen, a lower alkyl, alkenyl, substituted alkyl, acrylic-fuctional or thio-functional organic group and in that Y is a chlorine atom or a methoxy, ethoxy or trimethylsiloxy group.

Claim 9

A method according to any one of the preceding claims characterised in that in Component (C) or (C ) each R group is a saturated aliphatic or an aromatic hydrocarbon group.

Claim 10

A method according to any one of the preceding claims characterised in that each R in Component (C) or (C') is a methyl group.

Claim 11

A method according to any one of the preceding claims characterised in that (C ) is used and in that each R therein denotes a methyl group.