IMPACT-MODIFIED POLYCARBONATE COMPOSITIONS HAVING A GOOD COMBINATION OF NATURAL COLOR, HYDROLYTIC STABILITY AND MELT STABILITY
First Claim
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1. A Composition comprisingA) from 10 to 99 parts by weight, in each case based on the sum of components A+B+C, of aromatic polycarbonate and/or aromatic polyester carbonate,B) from 1 to 35 parts by weight, in each case based on the sum of components A+B+C, of rubber-modified graft polymer ofB.1 from 5 to 95 wt. % of at least one vinyl monomer onB.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature <
- 10°
C.,C) from 0 to 40 parts by weight, in each case based on the sum of components A+B+C, of vinyl (co)polymer and/or polyalkylene terephthalate,D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent,E) from 0 to 1.0 part by weight, in each case based on the sum of components A+B+C, of acidic additives, andF) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives,wherein component B is obtainable by reacting component B.1 with the graft base B.2 by means of emulsion polymerization,with the proviso that in a composition that is free of components D) and E), the graft polymer dispersion in the spray drying or in the precipitation has a pH value of less than 7, and wherein, in the graft reaction, there is included from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 that are used=100 parts by weight) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, and wherein said at least one emulsifier remains in component B.
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Abstract
The present invention relates to polycarbonate compositions comprising
- A) from 10 to 99 parts by weight, in each ease based on the sum of components A+B+C, of aromatic polycarbonate and/or aromatic polyester carbonate,
- B) from 1 to 35 parts by weight, in each case based on the sum of components A+B+C, of rubber-modified graft polymer of
- B.1 from 5 to 95 wt. % of at least one vinyl monomer on
- B.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature <10° C.,
- C) from 0 to 40 parts by weight, in each case based on the sum of components A+B+C, of vinyl (co)polymer and/or polyalkylene terephthalate,
- D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent,
- E) from 0 to 1.0 part by weight, in each case based on the sum of components A+B+C, of acidic additives, and
- F) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives,
- wherein component B is obtainable by reacting component B.1 with the graft base B.2 by means of emulsion polymerization, with the proviso that in those compositions that are free of components D) and E), the graft polymer dispersion in the spray drying or in the precipitation has a pH value of less than 7,
- characterized in that there are used in the graft reaction from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 that are used=100 parts by weight) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, wherein the emulsifier or emulsifiers remains or remain in component B,
and also to a process for the preparation of these polycarbonate compositions and to the use of the polycarbonate compositions in the production of molded bodies, and to the molded bodies themselves.
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Citations
11 Claims
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1. A Composition comprising
A) from 10 to 99 parts by weight, in each case based on the sum of components A+B+C, of aromatic polycarbonate and/or aromatic polyester carbonate, B) from 1 to 35 parts by weight, in each case based on the sum of components A+B+C, of rubber-modified graft polymer of B.1 from 5 to 95 wt. % of at least one vinyl monomer on B.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature < - 10°
C.,C) from 0 to 40 parts by weight, in each case based on the sum of components A+B+C, of vinyl (co)polymer and/or polyalkylene terephthalate, D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent, E) from 0 to 1.0 part by weight, in each case based on the sum of components A+B+C, of acidic additives, and F) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives, wherein component B is obtainable by reacting component B.1 with the graft base B.2 by means of emulsion polymerization, with the proviso that in a composition that is free of components D) and E), the graft polymer dispersion in the spray drying or in the precipitation has a pH value of less than 7, and wherein, in the graft reaction, there is included from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 that are used=100 parts by weight) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, and wherein said at least one emulsifier remains in component B. - View Dependent Claims (2, 3, 4, 10, 11)
- 10°
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5. Process for the preparation of an impact-modified polycarbonate molding composition which has an improved natural color along with good hydrolytic stability and processing stability of the impact-modified polycarbonate molding composition, wherein the constituents of said composition comprise:
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A) from 10 to 99 parts by weight of aromatic polycarbonate and/or aromatic polyester carbonate, B) from 1 to 35 parts by weight of rubber-modified graft, polymer of B.1 from 5 to 95 wt. % of at least one vinyl monomer on B.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature <
10°
C.,C) from 0 to 40 parts by weight of vinyl (copolymer and/or polyalkylene terephthalate, D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent, E) from 0 to 1.0 part, by weight, in each case based on the sum of components A+B+C, of acidic additives, and F) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives, wherein said process comprises mixing said components A-F, either in succession or simultaneously, at a temperature of about 20°
C. or at a higher temperature, and melt compounding and melt extruding at a temperature of from 260°
C. to 300°
C.,wherein said composition comprises as an impact modifier, a rubber-modified graft polymer (component B), which is prepared by reacting component B.1 with the graft base B.2 by means of emulsion polymerization, wherein (i) in a first step, the rubber base B.2 is prepared directly in the form of an aqueous dispersion by means of radical emulsion polymerization or is dispersed in water, (ii) in a second step, a graft reaction of component B.1 with the graft base B.2 is carried out by means of emulsion polymerization, wherein 1) component B.2 is dispersed in water to form a rubber base dispersion, 2) there is provided from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 used in the preparation of the graft polymer B=100 parts by weight.) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, and there is further provided a monomer according to component B.1 and a radical formers, as well as, optionally, a molecular weight regulator for the rubber base dispersion obtained in step (1), 3) working up by 3.1) spray drying and/or 3.2) by a process comprising the steps 3.2.1) precipitation and 3.2.2) separation of the dispersing water, with the proviso that, in a composition that is free of components D) and E), the graft polymer dispersion in the spray drying (3.1) or in the precipitation (3.2.1) has a pH value of less than 7, and wherein the resulting moist graft polymer is not washed with additional water. - View Dependent Claims (6, 7, 8, 9)
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Specification