Use of clear coating based on organic polyisocyanates for coating sheet products based on polyvinyl chloride

• US 4,456,658 A
• Filed: 01/10/1983
• Issued: 06/26/1984
• Est. Priority Date: 01/23/1982
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Kubitza, Werner, Mennicken, Gerhard
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US06/457,104
• Time in Patent Office: 533 Days
• Field of Search: 428/424.6, 428/422.8, 428/319.3, 428/319.7, 428/522, 528/59, 528/73
• US Class Current: 428/424.6
• CPC Class Codes: C08G 18/307 Atmospheric humidity
• CPC Class Codes: C08J 2327/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C09D 175/02 Polyureas
• CPC Class Codes: Y10T 428/3158 Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

The present invention relates to a process for coating polyvinyl chloride sheet products, optionally containing plasticizers, with clear coatings which can be hardened under the influence of atmospheric moisture and have a viscosity at 23° C. of from about 60 to 2500 mPa.s, and which contain (a) at least one polyisocyanate which is liquid at room temperature, (b) up to about 15% by weight, based on the coating of solvents, and optionally (c) conventional auxiliary agents and additives, and to the coated products produced therefrom.

Claims

1. A process for coating polyvinyl chloride sheet products which comprises coating said sheet products with a clear coating

(i) capable of hardening by reacting with atmospheric moisture,

(ii) having a viscosity at 23°

C. of from about 60 to 2500 mPa.s,

(iii) containing up to about 15% by weight, based on the weight of said coating, of solvents which are inert towards isocyanate groups and

(iv) wherein the binder of said coating consists essentially of at least one polyisocyanate which is liquid at room temperature.

2. The process of claim 1 wherein said coating additionally contains auxiliary agents and additives which are inert towards isocyanate groups.

3. The process of claim 2 wherein said coating has a viscosity at 23°

C. of from about 100 to 1000 mPa.s.

4. The process of claim 2 wherein said sheet products are based on a homopolymer, graft polymer or copolymer of vinyl chloride containing at least about 50% by weight of vinyl chloride incorporated by polymerization and containing from about 5 to 30% by weight, based on the polymer, of a plasticizer.

5. The coated sheet product produced in accordance with claim 2.