Plastic articles digestible by hot alkaline treatment

Details Plastic articles digestible by hot alkaline treatment Plastic articles digestible by hot alkaline treatment

2005-03-29

2005-03-29

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C428S533000, C524S423000

Reexamination Certificate

active

06872802

ABSTRACT:
A method of disposing of a biodegradable plastic comprises the step of exposing the biodegradable plastic to a hot alkaline solution. The biodegradable plastic is a polyhydroxyalkanoate copolymer comprising two randomly repeating monomer units wherein the first randomly repeating monomer unit has the structure:wherein R1is H or a C1-2alkyl, and n is 1 or 2; and the second randomly repeating monomer unit has the structure:wherein R2is a C3-19alkyl or a C3-19alkenyl. At least 50% of the randomly repeating monomer units have the structure of the first randomly repeating monomer unit.

REFERENCES:
patent: 5472518 (1995-12-01), Patnode et al.
patent: 6162852 (2000-12-01), Honeycutt et al.
patent: 0 573 042 (1993-12-01), None
patent: 0 679 412 (1995-11-01), None
patent: WO 9520621 (1995-08-01), None
Annual Review of Microbiology; Microbial Degradation of Polyhydroxyalkanoates; Dieter Jendrossek and René Handrick; Oct. 2002, vol. 56, pp. 403-432.*
Shimamura et al., Physical Properties and Biodegradabilityof Microbial Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), Macromolecules, 1994, vol. 27, pp. 878-880.
JP 08 253619 A, abstract, Patent Abstracts of Japan, 08253619, Jan. 19, 1996.

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