Process for preparing molded product of thermochromic polyvinyl chloride

• US 4,826,550 A
• Filed: 11/21/1986
• Issued: 05/02/1989
• Est. Priority Date: 11/28/1985
• Status: Expired due to Fees

• Current Assignee: Matsui Shikiso Chemical Co., Ltd.
• Original Assignee: Matsui Shikiso Chemical Co., Ltd.
• Inventors: Kitagawa, Yosuke, Shimizu, Goro, Hayashi, Yoshimi
• Primary Examiner(s): LORIN, HUBERT C
• Application Number:
  US06/933,630
• Time in Patent Office: 893 Days
• Field of Search: 252/586, 430/138, 430/964, 106/22, 106/288 R, 106/21, 264/4.1, 264/4.32, 264/4.33, 264/137, 264/209.1, 264/241, 264/299, 427/213.3, 427/213.31, 427/421, 427/428, 427/356, 427/358, 427/145, 156/166
• US Class Current: 156/166
• CPC Class Codes: C08K 9/10 Encapsulated ingredients
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture

Abstract

A process for preparing a molded product of thermochromic polyvinyl chloride characterized by incorporating a thermochromic particulate material into a vinyl chloride plastisol comprising a vinyl chloride resin, plasticizer, stabilizer, lubricant and filler, and molding the resulting mixture. The thermochromic particulate material is prepared from particles of a non-thermoplastic resin having encapusated therein the three components of electron-donating chromogenic substance, electron-accepting substance and solvent by coating the particles with a hydrophilic high-molecular-weight compound.

Claims

1. Process for preparing a molded product comprising thermochromic polyvinyl chloride, which comprises incorporating a thermochromic particulate material into a vinyl chloride plastisol comprising a vinyl chloride resin, plasticizer, stabilizer and lubricant and molding and heating the resulting mixture to form the product, the thermochromic particulate material being prepared from particles of a non-thermoplastic resin having encapsulated therein the three components of electron donating chromogenic substance, electron accepting substance and solvent, said three components comprising a thermally color changeable reversible color system, by coating the particles with a hydrophilic high-molecular weight compound which is resistant to penetration of the plasticizer, stabilizer and lubricant therethrough into the particles and thereby providing the particles as corresponding double capsules having a hydrophilic high-molecular weight compound outer encapsulating and inward penetration protective layer and a non-thermoplastic resin inner encapsulating and outward penetration protective layer.

2. Process of claim 1, wherein the plastisol also includes a petroleum solvent and the hydrophilic high-molecular weight compound is also resistant to penetration of the petroleum solvent therethrough into the particles.

3. Process of claim 1, wherein the hydrophilic high-molecular weight compound is selected from the group consisting of polyvinyl alcohol, polyacrylic acid, gelatin, methylcellulose and alginic acid, the non-thermoplastic resin is resistant to organic solvents, water and heat, the solvent is substantially water insoluble and has a boiling point of at least 150°

C. at atmospheric pressure, and the particles are resistant to rupture when exposed to increased pressure.

4. Process of claim 1, wherein the molding is carried out in a mold to form a hollow shaped product.

5. Process of claim 2 wherein said molding comprises applying said mixture to a yarn by impregnation to form a coating thereon and passing the impregnated yarn through a molding nozzle and heating to form a coated yarn product.

6. Process of claim 5, wherein the yarn is a polyester filament yarn.

7. Process of claim 1 wherein said molding comprises applying said mixture by a molding element as an outer layer onto a vinyl chloride polymer base layer disposed on a substrate sheet, and heating the outer layer to form a double layer containing substrate sheet product.

8. Process of claim 7, wherein the base layer contains a coloring substance of a different color from that of the thermochromic particulate material in the outer layer.

9. Process of claim 1, wherein said vinyl chloride plastisol further comprises a filler.