Coating layer with self-repairing properties for panes exposed to atmospheric agents

• US 4,657,796 A
• Filed: 12/06/1985
• Issued: 04/14/1987
• Est. Priority Date: 12/06/1984
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Vitrage
• Original Assignee: Saint-Gobain Vitrage
• Inventors: Holzer, Gerhard, Raedisch, Helmer, Musil, Ingrid
• Primary Examiner(s): CANNON, JAMES
• Application Number:
  US06/805,784
• Time in Patent Office: 494 Days
• Field of Search: 528/60, 528/66, 427/164, 427/165, 428/38, 428/425.6, 428/423.3
• US Class Current: 428/38
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/762 Self-repairing, self-healing
• CPC Class Codes: B32B 2375/00 Polyureas; Polyurethanes
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/40 comprising polyurethanes
• CPC Class Codes: C08G 18/4219 from aromatic dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
• CPC Class Codes: C08G 18/4277 Caprolactone and/or substituted caprolactone
• CPC Class Codes: C08G 18/7831 containing biuret groups
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: Y10T 428/31554 Next to second layer of polyamidoester
• CPC Class Codes: Y10T 428/31598 Next to silicon-containing [silicone, cement, etc.] layer

Abstract

A polyurethane coating layer, with self-repairing properties, for panes made of glass and/or plastic materials, which are exposed to atmospheric agents. The coating layer according to the invention is formed from a reactive mixture of a trifunctional isocyanate component such as the biurets or isocyanurates of 1,6 hexamethylenediisocyanate, having a content of about 15 to 25% by weight of NCO radicals and a polyalcohol component chosen from the plurifunctional polyester polyalcohols having about a 3 to 12% by weight content of OH radicals.

Claims

1. A transparent polyurethane coating layer with self-repairing properties for panes or transparent objects made of glass or plastic material, formed from a reactive mixture comprising a plurifunctional isocyanate component and a plurifunctional polyalcohol component, wherein the isocyanate component of the reactive mixture is chosen from the essentially trifunctional aliphatic polymers formed from 1,6-hexamethylenediisocyanate monomer, having an NCO radical content of 15 to 25% by weight and the polyalcohol component of the reactive mixture is a plurifunctional polyester polyalcohol having an OH radical content of 3 to 12% by weight.

2. Polyurethane coating layer according to claim 1, wherein the polyalcohol component utilized is a slightly ramified polyester polyalcohol, with a base of trimethylopropane, 1,6-hexanediol, adipic acid, o-phtalic acid and i-phtalic acid, having an OH radical content of 3 to 5% by weight.

3. Polyurethane coating layer according to claim 1, wherein the polyalcohol component is a trifunctional polycaprolactone having an OH radical content of 8 to 12% by weight.

4. Polyurethane coating layer according to claim 1, wherein a reactive mixture having an NCO/OH ratio of 0.9 to 1.1 and preferably of about 1 is utilized.

5. Polyurethane coating layer according to claim 1, wherein the reactive mixture contains at least one of the following additives:

dibutyltin dilaurate as a reaction catalyst, an extending agent selected from the group consisting of silicone oils, silicone resins, fluoroalkyl esters and mixtures thereof in a quantity of 0.05% to 0.15% by weight, 0.5 to 2% by weight of bis-sebacate (1,2,2,6,6-pentamethyl-4-piperidyle) as a light-protective agent and substituted benzotriazoles as ultraviolet absorbing agents in a quantity of 0.5 to 5% by weight.

6. Pane comprising a coating layer according to claim 1.

7. Sheet of plastic material characterized in that it comprises a polyurethane layer according to claim 1.

8. Sheet according to claim 7, characterized in that the polyurethane layer is combined with a polyurethane layer having energy absorbing properties.