Degradable polymer and preparation process of the same

Details Degradable polymer and preparation process of the same Degradable polymer and preparation process of the same

1997-09-08

1999-06-22

Nutter, Nathan M.

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

Synthetic resins

From carbohydrate or derivative as a reactant

527311, 527315, 525 542, 525 5421, 525 5424, 525 543, 525 5431, C08J 6308, C08B 300, C08B 1300, C08G 63664

Patent

active

059143819

ABSTRACT:
A degradable polymer and a process for preparing the degradable polymer which has a structure resulting from combination of a star-shaped polymer comprising a polyfunctional base compound of polycarboxylic acid having three or more carboxyl groups and/or anhydride of the same or aliphatic polyhydric alcohol having three or more hydroxyl groups and a unit of aliphatic hydroxycarboxylic acid, with aliphatic polyhydric alcohol having two or more hydroxyl groups or polycarboxylic acid having two or more carboxyl groups or anhydrides of the same. The degradable polymer leads to remarkably low coloration as compared with a polymer comprising polysaccharide as a polyfunctional base compound, has high melt tension as compared to common aliphatic polyester is excellent in processability on various molding methods, foam molding and blow molding in particular, and high transparency.

REFERENCES:
patent: 3806473 (1974-04-01), Lombardi et al.
patent: 5210108 (1993-05-01), Spinu et al.
patent: 5401796 (1995-03-01), Kashima et al.
patent: 5412067 (1995-05-01), Shinoda et al.
patent: 5637631 (1997-06-01), Kitada et al.
patent: 5714230 (1998-02-01), Kameoka et al.

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