Bead polymers containing fluorine

• US 5,093,445 A
• Filed: 02/26/1988
• Issued: 03/03/1992
• Est. Priority Date: 03/12/1987
• Status: Expired due to Term

• Current Assignee: Agfa-Gevaert Healthcare GmbH (Agfa-Gevaert N.V.)
• Original Assignee: Agfa-Gevaert AG (Agfa-Gevaert N.V.)
• Inventors: De Winter, Walter, Podszun, Wolfgang, Timmerman, Daniel, Suling, Carlhans
• Primary Examiner(s): Henderson, Christopher
• Application Number:
  US07/160,822
• Time in Patent Office: 1,467 Days
• Field of Search: 526/243, 526/245, 526/247
• US Class Current: 526/243
• CPC Class Codes: C08F 220/22 Esters containing halogen
• CPC Class Codes: C08F 220/387 and containing nitrogen and oxygen
• CPC Class Codes: G03C 1/95 rendered opaque or writable, e.g. with inert particulate additives G03C1/775 takes precedence

Abstract

Bead polymers having an average particle diameter of from 0.5 to 10 μm and a narrow particle diameter distribution of K≦0.25 and containing from 1 to 60% by weight of chemically bound fluorine are suitable for use as matting agents and spacers in photographic recording materials.

Claims

1. Bead polymers containing from 1 to 60% by weight of chemically bound fluorine and having an average particle diameter of from 0.5 to 10 μ

m and a narrow particle diameter distribution of K<

0.25.

2. Bead polymers according to claim 1, characterised in that they contain 2 to 75% by weight of copolymerised monomer units corresponding to formula I:

##STR4## wherein A denotes --O--, ##STR5## R₁ denotes H, CH₃ R₂ denotes --C_n F_2n+1,

R₃ denotes H, C₁ to C₆ -alkyl and

n represents a value from 4 to 20.

3. Bead polymers according to claim 1, characterised in that they contain from 2 to 75% by weight of copolymerised monomer units corresponding to formula II ##STR6## wherein R₁, R₂ and R₃ have the meanings indicated in claim 2.

4. Bead polymers according to claim 3, characterised in that they contain from 2 to 75% by weight of copolymerised monomer units corresponding to formula II and from 25 to 98% by weight of co-polymerised methyl methacrylate.