Polyester-modified polybutadienols for producing polyurethane elastomers and thermoplastic polyurethanes

Patent metadata

Field	Value
Publication number	US-11066508-B2
Application number	US-201515504493-A
Country	US
Kind code	B2
Filing date	Aug 17, 2015
Priority date	Aug 18, 2014
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

The invention relates to polyurethanes obtainable by reaction of (a) polyisocyanates A selected from modified or unmodified 4,4′-methanediphenyl diisocyanate, higher nuclear homologs of 4,4′-methanediphenyl diisocyanate, isocyanated groups containing prepolymers based on 4,4′-methanediphenyl diisocyanate, and mixtures thereof, with (b) compounds having at least two isocyanate-reactive hydrogen atoms, comprising (b1) block copolymers formed from a polybutadienol and a cyclic ester as component B1, and (b2) low molecular weight extenders or crosslinkers each having a molecular weight of 62 to 500 g/mol as component B2.

First claim

We claim:

1. A polyurethane obtainable by reaction of:
a) 30 to 150 parts by weight of polyisocyanates A selected from the group consisting of modified 4,4′-methanediphenyl diisocyanate, unmodified 4,4′-methanediphenyl diisocyanate, higher nuclear homologs of 4,4′-methanediphenyl diisocyanate, isocyanate groups containing prepolymers based on 4,4′-methanediphenyl diisocyanate and polyetherols, and mixtures thereof,
b1) 100 parts by weight of block copolymers formed from a polybutadienol and a cyclic ester as component B1,
b2) 4 to 15 parts by weight of at least one of diols as low molecular weight extenders and triols as crosslinkers, each having a molecular weight of 62 to 500 g/mol as component B2,
c) 0 to 100 parts by weight of polymeric compounds C having at least 2 isocyanate-reactive hydrogen atoms, selected from the group consisting of
polyetherols, polycarbonate, polyols and polyesterols having a molecular weight of 500 to 12,000 g/mol and an average functionality of 2 to 6,
d) 0 to 5 parts by weight of catalysts D,
e) 0 to 3 parts by weight of water E,
f) 0 to 10 parts by weight of physical blowing agents F, and
g) 0 to 100 parts by weight of auxiliaries, added-substance materials, and mixtures thereof as component G, selected from the group consisting of surface-active substances, foam stabilizers, cell regulators, release agents, fillers, dyes, pigments, hydrolysis control agents, flame retardants, odor-absorbent substances, fungistatically active substances and bacteriostatically active substances;
wherein the polyisocyanates A are reacted with a mixture of components b1), b2) and optionally one or more of components c), d), e), f), and g),
wherein the polyol component B1 has a number average molecular weight in the range from 600 to 15,000 g/mol, an ε-caprolactone fraction of from 10 to 50 wt. %, and an OH functionality of 1.5 to 2.2, and
wherein the extender of component B2 is 1,4-butanediol.

2. The polyurethane according to claim 1 , wherein the cyclic ester is selected from the group consisting of ε-caprolactone, 1,6-dioxacyclododecane-7,12-dione and oxacyclodecan-2-one.

3. The polyurethane according to claim 1 , wherein the crosslinker of component B2 is selected from the group consisting of ethoxylated glycerol, propoxylated glycerol, mixtures thereof, and trimethylolpropane.

4. The polyurethane according to claim 1 , wherein a) includes 30 to 150 parts by weight of polyisocyanates A selected from the group consisting of modified 4,4′-methane diphenyldiisocyanate, unmodified 4,4′-methanediphenyl diisocyanate, higher nuclear homologs of 4,4′-methanediphenyl diisocyanate and mixtures thereof.

Assignees

• Basf Se

Inventors

• Eling Berend
• Dilcher Jan
• Fink Irina
• Luinstra Gerrit

Classifications

• C08J9/12

  by a physical blowing agent · CPC title

• C08G18/797

  containing carbodiimide and/or uretone-imine groups · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C08G18/6511

  compounds of group C08G18/3203 · CPC title

• C08G18/6208 Primary

  Hydrogenated polymers of conjugated dienes · CPC title