Soft, transparent and processable thermoplastic polyurethane
AssigneeBayer Aktiengesellschaft
InventorsSteven C. Manning, Charles S. Gracik, Arthur W. Mason, Jack C. Chan
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Abstract
A soft, transparent and processable thermoplastic polyurethane resin suitable in optical application is disclosed. The resin is the product of reacting a diisocyanate, a chain extender, and a mixture of polyether polyols. The mixture of polyether polyols comprise (A) a C4 polyether polyol and (B) a C2-C3 polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.
Claims13
A soft, transparent and processable thermoplastic polyurethane resin having a shore A hardness of about 60 to 80, prepared by reacting (i) about 15 to 45% of at least one duisocyanate, and (ii) 3 to 15% of at least one chain extender, and (iii) 40 to 80% of a mixture of polyether polyols, said percents being in relation to the total weight of (i), (ii) and (iii), said mixture of polyether polyols comprising
- (A) a C4 polyether polyol having a number average molecular weight of about 500 to 2500 g/mol conforming structurally to
- HO—(CH2—CH2—CH2—CH2—O)n—H
- and
- (B) a C2-C3 polyether polyol having a number average molecular weight of about 2100 to 6000 g/mol, conforming structurally to
- where x and z independently denote integers of 1 to 10 and where y denotes an integer of 35 to 80, and where the weight ratio A/B is in the range of about 85/15 to 30/70.
A soft, transparent and processable thermoplastic polyurethane resin having a shore A hardness of about 70 to 78, prepared by reacting (i) about 25 to 35% of at least one diisocyanate, and (ii) 5 to 12% of at least one chain extender, and (iii) 55 to 65% of a mixture of polyether polyols, said percents being in relation to the total weight of (i), (ii) and (iii), said mixture comprising as reactant (A) a C4 polyether polyol having a number average molecular weight of about 800 to 1200 g/mol conforming structurally to
- HO—(CH2—CH2—CH2—CH2—O)n—H
- and (B) a C2-C3 polyether polyol having a number average molecular weight of about 3500 to 4500 g/mol, conforming structurally to
- where x and z independently denote integers of 7 to 9, and where y denotes 50 to 60 and wherein the weight ratio of A/B is in the range of about 70/30 to 30/70.
A soft, transparent and processable thermoplastic polyurethane resin having a shore A hardness of about 70 to 78, prepared by reacting (i) about 25 to 35% of at least one aliphatic diisocyanate, and (ii) 5 to 12% of at least one chain extender selected from the group consisting of ethylene glycol, diethylene glycol, 1,4 butanediol and 1,6-hexane diol, and (iii) 55 to 65% of a mixture of polyether polyols, said percents being in relation to the total weight of (i), (ii) and (iii), said mixture of polyether polyols comprising
- (A) a C4 polyether polyol having a number average molecular weight of about 800 to 1200 g/mol conforming structurally to
- HO—(CH2—CH2—CH2—CH2—O)n—H
- and
- (B) a C2-C3 polyether polyol having a number average molecular weight of about 3500 to 4500 g/mol, conforming structurally to
- where x and z independently denote integers of 7 to 9, and where y denotes 50 to 60 and wherein the weight ratio of A/B is in the range of about 70/30 to 30/70.
Dependencies are inferred from the claim text.