Radiation hardenable primer

• US 4,528,307 A
• Filed: 09/15/1983
• Issued: 07/09/1985
• Est. Priority Date: 09/25/1982
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Fuhr, Karl, Freier, Hans-Joachim
• Primary Examiner(s): Lilling, Herbert J.
• Application Number:
  US06/532,282
• Time in Patent Office: 663 Days
• Field of Search: 525/176, 525/175, 525/278, 525/286, 525/539, 525/112, 525/126, 525/423-426, 525/444, 525/445, 525/438, 525/440, 204/159.19, 204/159.15, 524/471, 524/472, 524/473, 524/850, 524/847, 524/413, 524/494, 524/854, 523/440, 523/443, 523/439, 523/513, 523/523, 523/527
• US Class Current: 522/83
• CPC Class Codes: C04B 18/26 Wood, e.g. sawdust, wood shavings
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/4505 characterised by the method of application
• CPC Class Codes: C04B 41/483 Polyacrylates
• CPC Class Codes: C04B 41/63 Macromolecular compounds
• CPC Class Codes: C08K 7/02 Fibres or whiskers
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete
• CPC Class Codes: Y10T 428/31895 Paper or wood

Abstract

This invention relates to radiation hardenable primers based on prepolymers containing (meth) acryloyl groups and conventional auxiliary agents. The primers are characterized in that they contain organic and/or inorganic fibres having a fibre length distribution curve reaching its maximum in the region of from 50 to 600 μm. These primers are suitable for coating articles which have absorbent surfaces, in particular for the continuous coating of wood-concrete articles such as wood-concrete boards.

Claims

1. A radiation-hardenable primer comprising at least one prepolymer containing acryloyl groups, methacryloyl groups or both, and organic or inorganic fibers having a fiber length distribution curve with its maximum in the region of 50 to 600 μ

m.

2. A radiation-hardenable primer according to claim 1 wherein the at least one prepolymer is a polyester acrylate, a polyester methacrylate, a polyepoxy acrylate, a polyepoxy methacrylate, a polyurethane acrylate or a polyurethane methacrylate.

3. A radiation-hardenable primer according to claim 1, which contains from 20 to 80% by weight of at least one prepolymer containing acryloyl, methacryloyl groups or both and from 80 to 20% by weight of reactive radiation-hardenable monomers.

4. A radiation-hardenable primer according to claim 1, which contains from 10 to 30% by weight, based on the radiation hardenable constituents, of organic or inorganic fibres.

5. A radiation-hardenable primer according to claim 1, wherein the fibres are glass fibres.

6. A radiation-hardenable primer comprising at least one prepolymer comprising a polyurethane acrylate or polyurethane methacrylate and organic or inorganic fibers having a fiber length distribution curve with its maximum in the region of 50 to 600 μ

m.

7. A radiation-hardenable primer according to claim 6 wherein the prepolymer is a polyurethane acrylate which is the reaction product of isophorone diisocyanate, thiodiglycol, 2-hydroxyethylacrylate and ethoxylated trimethylol-propane.