Soft non-blocking polyurethanes
First Claim
1. A soft, non-blocking, thermoplastic polyurethane, said polyurethane containing within the polymer chain thereof units of a siloxane-polyoxyalkylene block copolymer of the formula (I) ##STR7## wherein x has a value of about 1 to 30;
- y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms;
R1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, and a phenylalkyl group; and
V and W are divalent linking groups.
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Accused Products
Abstract
Soft, non-blocking, thermoplastic polyurethanes are prepared by reacting a long chain polyester or polyether diol, a short chain diol, a diisocyanate and a silicone diol of the formula: ##STR1## wherein x has a value of about 1 to 30, y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms, R1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, or a phenylalkyl group, and V and W are divalent linking groups. A unique feature of the invention is that the polymers exhibit, less blocking, are less susceptible to hydrolysis and are highly transparent. These polyurethanes are particularly useful in fabricating medical tubing.
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Citations
23 Claims
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1. A soft, non-blocking, thermoplastic polyurethane, said polyurethane containing within the polymer chain thereof units of a siloxane-polyoxyalkylene block copolymer of the formula (I) ##STR7## wherein x has a value of about 1 to 30;
- y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms;
R1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, and a phenylalkyl group; and
V and W are divalent linking groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 22, 23)
- y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms;
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17. A soft, non-blocking, thermoplastic polyurethane, said polyurethane having a Shore A hardness of about 55 to 90 and being the reaction product of an aromatic or alicyclic diisocyanate, a short chain diol having 2 to 6 carbon atoms, a long chain polyether or polyester diol and a silicone diol of the formula (IV) ##STR10## where x has a value of about 1 to 30, y has a value of about 10 to 30, z is 2 to 4, R represents an ethylene or butylene group, and R1 represents an alkyl group, said silicone diol constituting about 5 to 10 weight percent of said polyurethane, said diisocyanate and said short chain diol constituting about 27 to 36 weight percent of said polyurethane, said silicone diol having a molecular weight in the range of about 1200 to 6000, and said long chain diol constituting the balance of said polyurethane and having a molecular weight in the range of about 1000 to 3000.
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18. A process for making a soft, non-blocking, thermoplastic polyurethane which comprises:
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(a) forming a diol mixture including a short chain diol, a long chain polyether or polyester diol, and a silicone diol of the formula (IV) ##STR11## where x has a value of about 1 to 30, y has a value of about 1 to 200, z is an integer of 2 or more, R is an alkylene group having 2 to 4 carbon atoms, and R1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, and a phenylalkyl group, (b) adding a diisocyanate to said diol mixture, (c) stirring said mixture to prevent separation thereof while said mixture reacts and forms a polyurethane, and (d) recovering said polyurethane. - View Dependent Claims (19, 20)
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21. A process for making a soft, non-blocking, thermoplastic polyurethane which comprises:
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(a) reacting a diisocyanate with a silicone diol of the formula (IV) to form an isocyanate terminated diol, ##STR12## where x has a value of about 1 to 30, y has a value of about 1 to 200, z is an integer of 2 or more, R is an alkylene group having 2 to 4 carbon atoms, and R1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, and a phenyalkyl group, (b) reacting said isocyanate terminated diol with a mixture of a long chain diol and a short chain diol to form a polyurethane, and (c) recovering said polyurethane.
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Specification