Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2007-03-27
2007-03-27
Buttner, David J. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C528S288000, C525S425000
Reexamination Certificate
active
10665126
ABSTRACT:
A biodegradable polyesteramide and preparation method, having a formulation that contains (a) a diacid: 30%˜70% by weight (b) a diol: 10%˜50% by weight (c) an amide: 5%˜70% by weight (d) a diamine: 10%˜70% by weight (e) a branching agent: 0%˜10% by weight (f) a catalyst: an organic compound containing tin, 0 ppm˜50 ppm total proportion by weight (g) an antioxidant: an aromatic antioxidant, 0%˜5% by weight. A polycondensation reaction proceeds under nitrogen protection, and at a temperature of 140° C.˜270° C., and under this reaction temperature a vacuum polycondensation reaction proceeds for 4–6 hours, whereupon the biodegradable polyesteramide is acquired having a melting point of 125° C.˜130° C., a stretchability strength of 19˜28 Mpa, a fracture tensibility ratio of 80%˜300%. Under conditions where PH=12 and at a temperature of 80° C. complete degradation can be realized. A structural formula for the biodegradable triblock polyesteramide is as below:in-line-formulae description="In-line Formulae" end="lead"?[OC(CH2)4—COO(CH2)4O]m[OC(CH2)4COHN(CH2)6NH]n[OC(CH2)6NH]p.in-line-formulae description="In-line Formulae" end="tail"?
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Chemical Abstracts registry number 59602-16-3 and structure.
Buttner David J.
Troxell Law Office PLLC
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