Polyhydroxycarboxylic acid and its production process

Details Polyhydroxycarboxylic acid and its production process Polyhydroxycarboxylic acid and its production process

2006-06-27

2006-06-27

Woodward, Ana (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C524S115000, C524S430000, C524S537000, C524S539000, C528S302000, C528S361000

Reexamination Certificate

active

07067611

ABSTRACT:
Polyhydroxycarhoxylic acids are provided, which are controlled in terms of the rate of biodegradability, and give molded or otherwise formed articles that are of uniform quality with neither premature strength drop nor premature deterioration of retention of outside shape, and their production process is provided as well. The poly-hydroxycarboxylic acids are obtained by ring-opening polymerization of cyclic esters. The polyhydroxy-carboxylic acids have a weight-average molecular weight (Mw) in the range of 10,000 to 1,000,000, a molecular weight distribution in the range of 1.0 to 2.5 as represented by the weight-average molecular weight-to-number-average molecular weight ratio (Mw/Mn) and a yellowness index (YI) of 40 or less, and have a precisely controlled rate of biodegradability.

REFERENCES:
patent: 2668162 (1954-02-01), Lowe
patent: 3297033 (1967-01-01), Schmitt
patent: 3468853 (1969-09-01), Schmitt
patent: 3636956 (1972-01-01), Schneider
patent: 5028667 (1991-07-01), McLain et al.
patent: 5310865 (1994-05-01), Enomoto et al.
patent: 5342969 (1994-08-01), Ford et al.
patent: 6140458 (2000-10-01), Terado et al.
patent: 0469520 (1992-02-01), None
patent: 0805182 (1997-11-01), None
patent: 09-328481 (1997-12-01), None
patent: 10-060136 (1998-03-01), None
patent: 10-080990 (1998-03-01), None
patent: 10-138371 (1998-05-01), None
patent: 10-337772 (1998-12-01), None
patent: 2000-119269 (2000-04-01), None

Affiliated with

Also associated with

Rating

Polyhydroxycarboxylic acid and its production process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polyhydroxycarboxylic acid and its production process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyhydroxycarboxylic acid and its production process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3631818