Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-12-15
1997-12-30
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525425, 525437, 525450, 528288, 528323, 528328, 528335, 528361, C08G 8100
Patent
active
057031770
ABSTRACT:
This invention relates to biologically degradable, partially crystalline block copolyester-polyamides comprising at least two chemically differently structured segments of which at least one is a polyester (PES) block or a copolyester (coPES) block, preferably with a number average molecular mass of 340 to 10,000 g/mole, and at least one is a polyamide (PA) block or a copolyamide (coPA) block, preferably with a number average molecular mass of 400 to 3,000 g/mole. In addition, copolyester-amide (coPEA) blocks can be employed, preferably with a number average molecular mass of 500 to 5,000 g/mole. The invention also relates to a polycondensation process for the manufacture of these partially crystalline block copolyester-polyamides. The block copolymers described are useful for the manufacture of fibers, foils, molded articles and hot melt-type adhesives. Molded components manufactured from the copolymers in accordance with the invention are biologically degradable and are capable of being composted.
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De Simone et al, J. Poly. Sci. 46: 1813-1820 (1992).
Shama et al., Int. Biodeterioration Bull. 17: 1-9 (1981).
Ems-Inventa AG
Short Patricia A.
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