Synthetic resin sheet material

• US 4,021,388 A
• Filed: 03/10/1976
• Issued: 05/03/1977
• Est. Priority Date: 05/18/1972
• Status: Expired due to Term

• Current Assignee: Coloroll Limited
• Original Assignee: Coloroll Limited
• Inventors: Griffin, Gerald Joseph Louis
• Primary Examiner(s): Rzucidlo, Eugene C.
• Application Number:
  US05/665,418
• Time in Patent Office: 419 Days
• Field of Search: 260/17.4 ST, 260/17 R, 260/13, 260/46.5 R, 260/23 XA, 260/23 S, 260/23 H, 260/18 TN, 260/DIG. 43, 526/5, 526/1
• US Class Current: 523/128
• CPC Class Codes: C08L 101/00 Compositions of unspecified macromolecular compounds
• CPC Class Codes: C08L 2201/06 Biodegradable
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 3/00 Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
• CPC Class Codes: C08L 75/06 from polyesters
• CPC Class Codes: Y10S 260/43 Promoting degradability of polymers

Abstract

A biodegradable composition comprises a synthetic resin, a biodegradable granular filler such as natural starch and preferably a substance autoxidizable to yield a peroxide which attacks the carbon to carbon linkages in the resin.

Claims

1. A biodegradable composition including a polymer having carbon to carbon linkages and dispersed therein from 5.5% to 50% by weight of starch granules, the surface of said granules being modified by reaction with a compound which reacts with hydroxyl groups to form an ether or an ester.

2. The composition of claim 1 wherein the said compound reacted with the said particle is an isocyanate.

3. The composition of claim 1 wherein the said compound reacted with the said particles is a silicone.

4. The composition of claim 1 containing from 2% to 5.5% by weight of a substance which autoxidizes to generate a peroxide or a hydroperoxide, said substance being selected from the group consisting of a fatty acid, a fatty acid ester, a natural fat and mixtures thereof.

5. The composition of claim 1 wherein the synthetic resin is polystyrene, polyvinyl chloride or polyurethane.