Title: Polyurethanes based on amino-acids or derivatives thereof

Abstract: Amino acid-urethane copolymers improved in elongation, tensile strength and flexing endurance are prepared by polymerizing a prepolymer having terminal isocyanate groups, obtained by reacting a polyether polyol having hydroxyl groups substantially at the terminals thereof with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, either with an amino acid-N-carboxylic acid anhydride or with a polyamino acid polymer obtained by polymerizing an amino acid-N-carboxylic acid anhydride.

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Inventors: Fujimoto, Yasuo (Yokohama, JA)
Tatsukawa, Keizo (Machida, JA)
Teranishi, Masayuki (Machida, JA)
Koshimoto, Shinsuke (Machida, JA)
Doiuchi, Toru (Dusseldorf, DT)

Application Number: 392756
Filing Date: 1973-08-29
Publication_date: 1976-01-13
Assignee: Kyowa Hakko Kogyo Co., Ltd. (JA)
Primary Class(es): 442/153 428/423.1, 428/425.1, 428/901, 525/403, 525/411, 525/454, 528/48, 528/52, 528/53, 528/54, 528/55, 528/56, 528/58, 528/59, 528/60
Other Classes:
US Patent Ref:

3488324	Jan, 1970	Garber et al.	260/77.
3634544	Jan, 1972	Takeda et al.	260/78.
3655628	Apr, 1972	Uchida et al.	260/77.
3725353	Apr, 1973	Fujimoto et al.	260/77.
3761451	Sep, 1973	Fujimoto et al.	260/77.

Other Refs:
Primary Examiner: Cockeram, H. S.
Assistant Examiner:
Attorney: Craig & Antonelli