Plastic particles with a high thermostability

US5714261A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Werner Siol · Pfungstadt, DE
• Markus Parusel · Messel, DE

Key dates

• Filing date: Dec 19, 1995
• Grant date: Feb 3, 1998
• Expiry date: Dec 19, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention concerns crosslinked plastic particles based on polymethyl (meth)acrylate PP with a particle diameter of 1-15 .mu.m, synthesized from the monomers: PA1 A) methyl methacrylate in fractions of 20 to 99.9 wt %; PA1 B) methacrylic acid ester of formula I: ##STR1## wherein R.sub.1 stands for a C.sub.2-8 alkyl radical, a C.sub.5-6 cycloalkyl radical, a C.sub.5-6 cycloalkyl radical substituted with C.sub.1 -C.sub.4 alkyl, a C.sub.6-14 aryl radical, a substituted C.sub.6-14 aryl radical or an aralkyl radical, in fractions of 0 to 79 wt %; PA1 C) acrylic acid ester of formula II: EQU CH.sub.2 =CH--COOR.sub.2 (II) wherein R.sub.2 stands for a C.sub.1-8 alkyl radical, a C.sub.5-6 cycloalkyl radical which can be substituted with C.sub.1 -C.sub.4 alkyl, or a perhaps substituted C.sub.6-14 aryl radical or an aralkyl radical, in fractions of 0 to 50; PA1 D) at least one crosslinking monomer CM, which is, in fact, known, containing at least two radically polymerizable groups in the molecule in fractions of 0.1 to 20 wt %, using molecular weight regulators MR, preferably so-called sulfur regulators, in fractions of 0.01 to 1 part by weight, based on the plastic particles PP.