Foam molded article with integral skin having an antibacterial effect

• US 5,824,407 A
• Filed: 07/29/1996
• Issued: 10/20/1998
• Est. Priority Date: 07/28/1995
• Status: Expired due to Fees

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Hayashi, Itsuki, Uchida, Sadao, Ushida, Yoshio
• Primary Examiner(s): RAIMUND, CHRISTOPHER W
• Application Number:
  US08/687,980
• Time in Patent Office: 813 Days
• Field of Search: 428/318.8, 428/319.3, 428/318.6, 521/51, 523/122
• US Class Current: 428/318.8
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 9/34 Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
• CPC Class Codes: Y10T 428/249988 Of about the same composition as, and adjacent to, the void-containing component
• CPC Class Codes: Y10T 428/249989 Integrally formed skin
• CPC Class Codes: Y10T 428/249991 Synthetic resin or natural rubbers

Abstract

The present invention relates to an integral-skin foam molded article which includes: a main body of the molded article comprising a flexible urethane foam molding material; and a coating layer comprising a polyurethane coating material formed on the surface of the main body of the molded article, either or both of said urethane foam molding material and coating layer containing one or more of an inorganic or organic antibacterial agent. This integral-skin foam molded article can maintain an anti-fungal and anti-bacterial action for a significantly long period of time and therefore does not undergo discoloration.

Claims

1. An integral-skin foam molded article which comprises:

a main body comprising at least one flexible urethane foam molding material; and

a coating layer formed on a surface of the main body, said coating layer comprising at least one polyurethane material and containing one or more of an inorganic or organic antibacterial agent.

2. An integral-skin foam molded article according to claim 1, wherein the flexible urethane foam molding material contains one or more of an inorganic or organic antibacterial agent.

3. An integral-skin foam molded article according to claim 2, wherein the main body of the molded article comprises a core layer of low density and a skin layer of high density.

4. An integral-skin foam molded article according to claim 1, wherein the main body of the molded article comprises a core layer of low density and a skin layer of high density.

5. An integral-skin foam molded article according to claim 1, wherein the polyurethane material of the coating layer comprises an isocyanate prepolymer obtained by a chain extension of a polyisocyanate with a polyol.

6. An integral-skin foam molded article according to claim 1, wherein the polyurethane material of the coating layer comprises a polyol component and a polyisocyanate component.

7. An integral-skin foam molded article according to claim 1, wherein the flexible urethane foam molding material comprises a mixture of a polyol component and an isocyanate component which contains substantially no foaming agent and which is limited in water content of the polyol component to less than about 0.4% by weight.

8. An integral-skin foam molded article according to claim 6, wherein the polyol component comprises a polyol and at least one member selected from the group consisting of a crosslinking agent, a catalyst, and a pigment.

9. An integral-skin foam molded article according to claim 7, wherein the polyol component comprises a polyol and at least one member selected from the group consisting of a crosslinking agent, a catalyst, and a pigment.

10. An integral-skin foam molded article according to claim 1, wherein the one or more inorganic antibacterial agent is a silver-supporting inorganic material selected from the group consisting of zeolite, apatite, montmorillonite and zirconium phosphate.

11. An integral-skin foam molded article according to claim 2, wherein the one or more inorganic antibacterial agent of the flexible urethane foam molding material is a silver-supporting inorganic material selected from the group consisting of zeolite, apatite, montmorillonite and zirconium phosphate.

12. An integral-skin foam molded article according to claim 1, wherein the one or more organic antibacterial agent is selected from the group consisting of benzimidazole antibacterial agents and 10, 10'"'"'-oxybisphenoxarsine.

13. An integral-skin foam molded article according to claim 2, wherein the one or more organic antibacterial agent of the flexible urethane foam molding material is selected from the group consisting of benzimidazole antibacterial agents and 10, 10'"'"'-oxybisphenoxarsine.

14. An integral-skin foam molded article according to claim 1, wherein the one or more inorganic or organic antibacterial agent is added in an amount of about 0.1 to about 10 parts for 100 parts of the polyurethane material of the coating layer.

15. An integral-skin foam molded article according to claim 2, wherein the one or more inorganic or organic antibacterial agent of the flexible urethane foam molding material is added in an amount of about 0.1 to about 10 parts for 100 parts of the flexible urethane foam molding material.

16. A process for producing an integral-skin foam molded article with antibacterial effect, comprising the steps of:

(a) applying a urethane coating material containing one or more of an antibacterial agent on a surface of a cavity for product comprising a pair of split molds to form a mold coat layer;

(b) drying the mold coat layer;

(c) closing the pair of split molds to form the cavity for product;

(d) reducing the cavity for product to a pressure of not more than about 50 Torr;

(e) introducing a flexible urethane foam molding material into the cavity for product;

(f) foaming and hardening the flexible urethane molding material to form a main body;

(g) integrating an outer surface of the main body with an inner surface of the mold coat layer to form the integral skin foam molded article.

17. A process for producing an integral-skin foam molded article with antibacterial effect according to claim 16, wherein the flexible urethane foam molding material of step (e) contains one or more of an antibacterial agent.

18. A process for producing an integral-skin foam molded article with antibacterial effect according to claim 16, wherein the step (e) comprises introducing a flexible urethane foam molding material into the cavity for product by reaction injection molding.