Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1993-07-15
1995-02-07
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525420, 525434, 528310, C08L 7712
Patent
active
053876512
ABSTRACT:
Block copolyetheramide suitable for injection molding, consisting of polyamide blocks and polyalkylene ether blocks and having a melting point ranging from 215.degree. to 223.degree. C., an apparent viscosity, at 230.degree. C., ranging from 50 to 150 Pa, a number average molecular weight ranging from 10,000 to 50,000 and a yellow degree, measured by means of an Elrepho.RTM. apparatus, lower than or equal to 20. They are prepared by polymerizing the polyamide monomers in the presence of hypophosphorous acid or meta-hypophosphorous acid and then by polycondensing the polyamide with polyalkylene ether having hydroxyl end groups.
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Enichem S.p.A.
Seidleck James J.
Zemel I.
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