All posts by Gerhard Bleys

A New Type of Ultra-Soft Thermoplastic Polyurethanes

Title: THERMOPLASTIC POLYURETHANES WITH CRYSTALLINE CHAIN ENDS

Number/Link: WO2014/070426

Applicant/Assignee: Lubrizol

Publication date: 8-05-2014

“Gist”: Easily processable, plasticizer-free ultra-soft TPU can be produced by incorporating a crystallizing polyolefin chain stopper.

Why it is interesting: It is well known that TPU with a shore hardness below about 65A is hard to produce and process because of its stickiness and low solidification/crystallization rate. According to the invention this problem can be solved by using a crystalline chain stopper in addition to the polyol, chain extender and di-isocyanate. The chain stopper is (preferably) a c20 to c70 polyolefin mono-alcohol. Apart from improving processability at low hardness, the incoproration of the olefin chain stopper also improves compatibility of the TPU with olefin thermoplastics. The chain stopper can also be grafted with e.g. a vinyl alkoxysilane to make a hybrid crosslinkable TPU. An interesting idea with many potential advantages and interesting effects.

Lubrizol logo

Flexible Foams from Renewable Polyester Polyols

Title: METHOD FOR PRODUCING SOFT POLYURETHANE FOAM BASED ON POLYESTER POLYOLS

Number/Link: WO2014/064130

Applicant/Assignee: Bayer

Publication date: 1-05-2014

“Gist”: Flexible foams can be prepared from polyester polyols based on two different diacids and with a limited ester group content.

Why it is interesting: According to this invention flexible foams can be based on polyester polyols only if the polyols are not too polar or too ‘symmetrical’. This is achieved by preparing the polyols from at least two diacids chosen from (preferably) succinic-, adipic-, azeleic- or sebacic acid, together with (e.g.) diethylene grlycol and some trimethylolpropane. Both the acids and the alcohols are preferably bio-based. The polyester polyols have an OH value of about 60 and an ester group content (polarity) of less than 9.8 mol/kg. In comparative examples flexible foams based on polyester polyols containing only one diacid showed collapse.

Sebacic Acid

2 Comments

by Gerhard Bleys on May 6, 2014 • Permalink

Posted in Flexible Foams, Polyols

Tagged bio-based materials, comfort, Environment, hydrophilic, mattress, memory foam, polarity, polyester, renewable materials

Posted by Gerhard Bleys on May 6, 2014

https://purpatents.com/2014/05/06/flexible-foams-from-renewable-polyester-polyols/

“Green” Isocyanate: Renewable and Phosgene-Free

Title: POLYISOCYANATES FROM FUSED BICYCLIC POLYOLS AND POLYURETHANES THEREFROM

Number/Link: WO2014/062631

Applicant/Assignee: IOWA STATE UNIVERSITY

Publication date: 24-04-2014

“Gist”: Isocyanates from acyl azides derived from isosorbide

Why it is interesting: Fused bicyclic polyols are reacted with anhydrides to form polyacids which are converted to acyl halides which in turn are converted to acyl azides. The acyl azides rearrange to isocyanates (Curtius Rearragment). For example isosorbide is reacted with succinic anhydride, then with thionylchloride (SOCl2) to form the di-acylchloride and then with sodium azide (NaN3) to form the di-acylazide which rearranges into the di-isocyanate under liberation of nitrogen. The isocyanate can be reacted with more isosorbide to form a polyurethane. Clever chemistry but hard to judge if it is industrially viable.

Completely renewable polyurethane according to the invention . Click to enlarge.

Innovation in Polyurethanes

All posts by Gerhard Bleys

A New Type of Ultra-Soft Thermoplastic Polyurethanes

Flexible Foams from Renewable Polyester Polyols

“Green” Isocyanate: Renewable and Phosgene-Free

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