UV-crosslinkable copolymers

• US 7,091,296 B2
• Filed: 02/04/2003
• Issued: 08/15/2006
• Est. Priority Date: 02/19/2002
• Status: Expired due to Term

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Becker, Heike, Schumacher, Karl-Heinz, Henkelmann, Jochem, Jung, Martin, Meyer, Harald, Erhardt, Ulrich
• Primary Examiner(s): Harlan, Robert D.
• Application Number:
  US10/502,647
• Publication Number:
  US 20050080213A1
• Time in Patent Office: 1,288 Days
• Field of Search: 526/319
• US Class Current: 526/319
• CPC Class Codes: C08F 246/00 Copolymers in which the nature of only the monomers in minority is defined

Abstract

The present invention relates to the use of acetophenone or benzophenone derivatives of the formula I

where
R is unsubstituted or substituted

• • C₁ to C₃ alkyl,
  • C₆ to C₁₀ aryl or
  • aralkyl having from 6 to 10 carbon atoms in the aryl moiety and from 1 to 6 carbon atoms in the alkyl moiety
    as copolymerizable photoinitiators.

The invention further relates to copolymers containing acetophenone or benzophenone derivatives of the formula I in copolymerized form, to processes for preparing said copolymers, and to the use of said copolymers in UV crosslinkable compositions.

Claims

1. A copolymerizable photoinitiator comprising acetophenone or benzophenone derivatives of the formula I,

2. A copolymer comprising from 0.01 to 10% by weight of acetophenone or benzophenone derivatives of the formula I in copolymerized form,

7. The copolymer as claimed in claim 2, having a glass transition temperature of from −

70 to +150°

C.

8. A UV-curable binder or adhesive comprising the copolymer as claimed in claim 2.

9. A pressure sensitive adhesive which comprises the UV-curable binder or adhesive as claimed in claim 8.

3. A process for preparing a copolymer, which comprises

polymerizing a mixture of ethylenically unsaturated compounds (monomers) comprising from 0.01 to 10% by weight of acetophenone or benzophenone derivatives of the formula I,

4. The process as claimed in claim 3, wherein said polymerizing step is initiated free-radically.

5. The process as claimed in claim 4, wherein said polymerizing step is carried out in the form of a solution polymerization.

6. A copolymer prepared by the process as claimed in claim 3.

10. The copolymer as claimed in claim 6 having a glass transition temperature of from −

70 to +150°

C.

11. A UV-curable binder or adhesive comprising the copolymer as claimed in claim 6.

12. A pressure sensitive adhesive which comprises the UV-curable binder or adhesive as claimed in claim 11.