US4564654A — Process for the preparation and/or further proces…

Claim 1

Independent Claim 236 words

A process for the production of a polymer blend consisting essentially of A-1 to 99% by weight of a thermoplastic aromatic tetramethylbisphenol F-containing polycarbonate and a copolymer selected from B-99 to 1% by weight of a styrene/acrylonitrile copolymer or C-99 to 1% by weight of a graft polymer, consisting of 5 to 95% by weight of a styrene/acrylonitrile copolymer and 95 to 5% by weight of a butadiene rubber with 0 to 50% by weight of comonomers in addition to butadiene, of an ethylene/propylene/diene rubber or of a rubber consisting of acrylates with 0 to 30% by weight of other comonomers, prepared by polymerisation of styrene/acrylonitrile blends in the presence of one of the stated rubbers, or combinations thereof, the sum of the components A+B+C being 100% by weight, in which the aromatic polycarbonate (A) contains at least 80% by weight of repeating structural units of the formula (1) ##STR4## and not more than 20% by weight of repeating structural units of the formula (3) ##STR5## wherein --O--R--O-- is a diphenolate radical, and the repeating structural units of the formula (1) must amount to at least 25% by weight of the aromatic polycarbonate; the amount of acrylonitrile in the styrene/acrylonitrile copolymer of components B and C is 1.5 to 15% by weight; and mixing of the components to form the blend is carried out at a temperature of above 270° C., in an extruder or kneader.

Claim 2

Dependent Claim 236 words

A process for the production of a polymer blend consisting essentially of A-1 to 99% by weight of a thermoplastic aromatic tetramethylbisphenol F-containing polycarbonate and a copolymer selected from B-99 to 1% by weight of a styrene/acrylonitrile copolymer or C-99 to 1% by weight of a graft polymer, consisting of 5 to 95% by weight of a styrene/acrylonitrile copolymer and 95 to 5% by weight of a butadiene rubber with 0 to 50% by weight of comonomers in addition to butadiene, of an ethylene/propylene/diene rubber or of a rubber consisting of acrylates with 0 to 30% by weight of other comonomers, prepared by polymerisation of styrene/acrylonitrile blends in the presence of one of the stated rubbers, or combinations thereof, the sum of the components A+B+C being 100% by weight, in which the aromatic polycarbonate (A) contains at least 80% by weight of repeating structural units of the formula (1) ##STR4## and not more than 20% by weight of repeating structural units of the formula (3) ##STR5## wherein --O--R--O-- is a diphenolate radical, and the repeating structural units of the formula (1) must amount to at least 25% by weight of the aromatic polycarbonate; the amount of acrylonitrile in the styrene/acrylonitrile copolymer of components B and C is 1.5 to 15% by weight; and mixing of the components to form the blend is carried out at a temperature of above 270° C., in an extruder or kneader.

Claim 3

Dependent Claim 22 words

A process according to claim 1 in which --O--R--O has 6 to 30 carbon atoms and which is different from formula (1).

Claim 4

Dependent Claim 23 words

A process according to claim 1 or 2 in which amount of acrylonitrile in the styrene/acrylonitrile copolymer is 7 to 10% by weight.

Claim 5

Dependent Claim 62 words

A process according to any of claims 1 or 2 in which a polymer combination of 70 to 90%, by weight, of a polycarbonate of component A and 30 to 10% by weight of a graft polymer of component C, where the graft polymer contains 65 to 90%, by weight, of rubber and 35 to 10% by weight styrene/acrylonitrile copolymer is mixed.

Claim 6

Dependent Claim 90 words

A process according to claims 1 or 2 in which a polymer combination of a polycarbonate of component A, a styrene/acrylonitrile copolymer of component B and a graft copolymer of component C is mixed, in which components A and B each amount to at least 10% by weight, components A and B together amount to 65 to 90% by weight and component C amounts to 10 to 35% by weight, and in which component C contains 65 to 90%, by weight, rubber and 5 to 10%, by weight, styrene/acrylonitrile copolymer.

Claim 7

Dependent Claim 40 words

A process according to claims 1 or 2 in which a polymer combination of 10 to 60%, by weight, of a polycarbonate of component A and 90 to 40%, by weight, of a styrene/acrylonitrile copolymer of component B is mixed.

Claim 8

Dependent Claim 58 words

A process according to claim 1 in which a polymer combination of 20 to 60%, by weight, of a polycarbonate of component A and 80 to 40% by weight of a graft polymer of component C where the graft polymer, which contains 15 to 50%, by weight, rubber and 85 to 50%, by weight, styrene/acrylonitrile copolymer is mixed.

Claim 9

Dependent Claim 26 words

A process according to claims 1 or 2, 7 or 9 in which the mixing is carried out at a temperature of 280° to 330° C.

Claim 10

Dependent Claim 58 words

A process according to claim 2 in which a polymer combination of 20 to 60%, by weight, of a polycarbonate of component A and 80 to 40%, by weight, of a graft polymer of component C where the graft polymer, which contains 15 to 50%, by weight, rubber and 85 to 50%, by weight, styrene/acrylonitrile copolymer is mixed.

Claim 11

Dependent Claim 15 words

A polymer blend produced by the process of claims 1 or 2, 7 or 9.

Claim 12

Dependent Claim 38 words

A process for further processing a polymer blend according to claim 9 to give shaped articles, in which the polymer blend is molded at a temperature above 270° C., in an extruder, injection molding machine or high-temperature press.

Claim 13

Dependent Claim 24 words

A shaped article produced by the process of claim 10 which is a washing machine component, a hot-water boiler, tableware or an automobile component.

Claim 14

Dependent Claim 13 words

A shaped article according to claim 11 which is an automobile headlight reflector.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-01-13	1989-07-15	1990-01-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-01-13	1993-07-15	1994-01-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-01-13	1997-07-15	1998-01-14	$7700.00	Window Closed / Lapsed

Process for the preparation and/or further processing of polymer blends

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