Photocurable organopolysiloxane compositions

• US 4,293,397 A
• Filed: 02/08/1980
• Issued: 10/06/1981
• Est. Priority Date: 02/23/1979
• Status: Expired due to Term

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Inomata, Hiroshi, Sato, Yasuhiko
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/120,084
• Time in Patent Office: 606 Days
• Field of Search: 204/159.13, 528/26, 528/33, 528/38, 528/41
• US Class Current: 522/99
• CPC Class Codes: C08G 77/388 containing nitrogen
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: G03F 7/0757 Macromolecular compounds containing Si-O, Si-C or Si-N bonds G03F7/0752 takes precedence

Abstract

The present invention provides a novel photocurable organopolysiloxane composition having remarkably high photocurability as well as insensitiveness to the retarding effect of atmospheric oxygen and capable of giving a thick cured product with elasticity. The inventive composition comprises a reaction product of an amino-terminated diorganopolysiloxane and glycidyl acrylate or glycidyl methacrylate admixed with a photosensitizer.

Claims

1. A photocurable organopolysiloxane composition which comprises (a) 100 parts by weight of an acryloyloxy-containing organopolysiloxane represented by the general formula ##STR13## where R¹ is a divalent hydrocarbon group, R² is a monovalent hydrocarbon group, X is a hydroxy group or a hydrolyzable group, k is zero or a positive integer not exceeding 4, m is a positive integer from 50 to 10,000, a is zero, 1 or 2 and at least two of the groups denoted by A in a molecule are each an acryloyloxy-containing group represented by the formula ##STR14## R³ being a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms and n being a positive integer from 1 to 10, the remainder of A being each a hydrogen atom, and (b) from 0.1 to 30 parts by weight of a photosensitizer.

2. The photocurable organopolysiloxane composition as claimed in claim 1 wherein R³ is a hydrogen atom or a methyl group and n is 1.

3. A method for the preparation of a photocurable organopolysiloxane composition which comprises

(a) reacting an amino-containing organopolysiloxane represented by the general formula ##STR15## where R¹ is a divalent hydrocarbon group, R² is a monovalent hydrocarbon group, X is a hydroxy group or a hydrolyzable group, k is zero or a positive integer not exceeding 4, m is a positive integer from 50 to 10,000 and a is zero, 1 or 2, with at least 2 moles, per mole of said organopolysiloxane, of a glycidyl-containing derivative of acrylic acid represented by the general formula, ##STR16## where R³ is a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms and n is a positive integer from 1 to 10, to give an acryloyloxy-containing organopolysiloxane, and (b) admixing said acryloyloxy-containing organopolysiloxane with 0.1 to 30% by weight of a photosensitizer.