| 主权项 |
1. A process for preparing an impact-modified polymer composition comprising
A) from 10 to 98 parts by weight, based on the sum of components A+B+C+D+E, of at least one polymer selected from the group consisting of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters, as well as mixtures thereof, B) from 0.5 to 50.0 parts by weight, based on the sum of components A+B+C+D+E, of at least one pulverulent rubber-modified vinyl (co)polymer, C) from 0 to 80 parts by weight, based on the sum of components A+B+C+D+E, of at least one component selected from the group consisting of rubber-modified vinyl (co)polymers in granulate form and rubber-free vinyl (co)polymers, D) from 0.002 to 0.200 part by weight, based on the sum of components A+B+C+D+E, of at least one Brönsted acid, E) from 0.1 to 40.0 parts by weight, based on the sum of components A+B+C+D+E, of one or more additives, with the exception of the Brönsted acid according to component D,
wherein the sum of the parts by weight of components A+B+C+D+E in the impact-modified polymer composition is 100, the process comprising:
(i) preparing a solution comprising the at least one Brönsted acid of component D with a concentration of from 0.3 to 30 wt. % in a solvent,(ii) physically blending the solution comprising the at least one Brönsted acid from (i) with the total amount or a partial amount of the at least one pulverulent rubber-modified vinyl (co)polymer of component B to form a mixture, wherein the solution comprising the at least one Brönsted acid is present in the mixture in an amount, based on the sum of components B and D in the mixture, of not more than 30 parts by weight, and(iii) melting, mixing and dispersing in one another the mixture from (ii) with the further and/or residual components A-E of the impact-modified polymer composition, which have optionally been premixed, in a compounding unit to produce the impact-modified polymer composition in the form of a polymer melt,wherein the solvent that has been added to the impact-modified polymer composition by the solution comprising the at least one Brönsted acid is removed in a degassing zone of the compounding unit by application of an absolute pressure of not more than 800 mbar, andwherein the polymer melt solidified by cooling and then granulated. |
