Method for making silicone-polyester copolymers
AssigneeGeneral Electric Company
InventorJohn E. Hallgren
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Abstract
A method is provided for making silicone-polyester block polymers comprising effecting reaction between an aminoalkylpolydiorganosiloxane and a polyester, such as a polyalkyleneterephthalate, under reduced pressure and under molten conditions.
Claims6
A method which comprises, agitating under reduced pressure at a temperature of 200.degree. C. to 350.degree. C. in the substantial absence of an organic solvent, a mixture of aminoalkyl chain-stopped polydiorganosiloxane and a molten thermoplastic polyester to produce a silicone-polyester copolymer having a silicone block and a polyester block joined together by a siloxy organoamide linkage having the formula ##STR7## where R.sup.1 is selected from C.sub.(1-13) monovalent hydrocarbon radicals, substituted C.sub.(1-13) monovalent hydrocarbon radicals and C.sub.(1-8) alkoxy radicals, R.sup.2 is a C.sub.(2-13) divalent organo radical and R.sup.6 is a C.sub.(6-13) divalent aromatic hydrocarbon radical.
Dependencies are inferred from the claim text.