Polyurethanes based on amino-acids or derivatives thereof
AssigneeKyowa Hakko Kogyo Co., Ltd.
InventorsYasuo Fujimoto, Keizo Tatsukawa, Masayuki Teranishi, Shinsuke Koshimoto, Toru Doiuchi
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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.
Claims19
A process for producing an amino acid-urethane copolymer which comprises polymerizing (I) a prepolymer having isocyanate groups, which is prepared by reacting a polyether polyol having hydroxyl groups substantially at the terminals thereof selected from the group consisting of (a) ring-cleaved polymers of alkylene oxides having 2 to 8 carbon atoms, (b) mixtures of said ring-cleaved polymers, (c) condensates of said alkylene oxides and alkylene glycols having 2 to 6 carbon atoms and (d) condensates of one or more of said alkylene glycols with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, with (II) an amino acid-N-carboxylic acid anhydride having the formula:
- ##EQU3## (wherein R and R.sup.1 are hydrogen atoms or monovalent organic residues, and R.sup.2 and R.sup.3 are divalent organic residues).
An amino acid-urethane copolymer produced by polymerizing (I) a prepolymer having isocyanate groups, which is prepared by reacting a polyether polyol (molecular weight:
- 300 - 5,000) having hydroxyl groups substantially at the terminals thereof selected from the group consisting of (a) ring-cleaved polymers of alkylene oxides having 2 to 8 carbon atoms, (b) mixtures of said ring-cleaved polymers, (c) condensates of said alkylene oxides and alkylene glycols having 2 to 6 carbon atoms and (d) condensates of one or more of said alkylene glycols with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, with (II) an amino acid-N-carboxylic acid anhydride having the formula:
- ##EQU4## (wherein R and R.sup.1 are hydrogen atoms or monovalent organic residues, and R.sup.2 and R.sup.3 are divalent organic residues).
Dependencies are inferred from the claim text.