Polyurethane with improved tear strength
AssigneeBASF SE
InventorsSebastian Richter, Zeljko Tomovic, Kathrin Cohen
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Abstract
The present invention relates to a thermoplastic polyurethane obtainable or obtained by reacting a polyisocyanate composition, a chain extender, and a polyol composition, wherein the polyol composition comprises a polyol (P1) which has a molecular weight Mw in the range from 1500 to 2500 g/mol and has at least one aromatic polyester block (B1). The present invention further relates to a process for producing a shaped body comprising such a thermoplastic polyurethane, and to shaped bodies obtainable or obtained by a process of the invention.
Claims12
A thermoplastic polyurethane obtained by reacting at least the following components (i) to (iii):
- (i) at least one polyisocyanate composition,
- (ii) at least one chain extender, and
- (iii) at least one polyol composition,
- wherein the at least one polyol composition comprises a polyol (P1) which has at least one aromatic polyester block (B1) and at least one aliphatic polyester block,
- wherein polyol (P1) is prepared by reacting an aromatic polyester which has a higher molecular weight than the blocks (B1) present in the polyol (P1);
- and
- wherein the at least one polyol composition comprises a further polyol selected from the group consisting of a polyetherol, a polyesterol, a polycarbonate alcohol and a hybrid polyol.
A process for producing a shaped body (SC), the process comprising:
- (a) preparing a thermoplastic polyurethane, the preparing comprising the reaction of
- (i) at least one polyisocyanate composition,
- (ii) at least one chain extender, and
- (iii) at least one polyol composition,
- wherein the at least one polyol composition comprises a polyol (P1) which has at least one aromatic polyester block (B1) ad at least one aliphatic polyester block,
- wherein polyol (P1) is prepared by reacting an aromatic polyester which has a higher molecular weight than the blocks (B1) present in the polyol (P1);
- and
- wherein the at least one polyol composition comprises a further polyol selected from the group consisting of a polyetherol, a polyesterol, a polycarbonate alcohol and a hybrid polyol and
- (b) producing a shaped body (SC) from the thermoplastic polyurethane.
Dependencies are inferred from the claim text.