All posts tagged Engineering thermoplastic

Crystalline High-Hardblock TPU

Title: CRYSTALLINE HIGH MODULUS THERMOPLASTIC POLYURETHANE

Number/Link:  WO2017079101  WO2017079188

Applicant/Assignee: Lubrizol

Publication Date: 11 May 2017

“Gist”: High-hardblock TPU using ‘stacking’ chain extenders and MDI

Why it is interesting: Thermoplastic polyurethanes with hardblock levels of 75% and higher were first patented by Upjohn in 1981 in a “classic” patent which has been discussed before in this blog. These materials – often marketed under the ‘ISOPLAST’ tradename- are usually produced from a diol, 4,4′-MDI and a (mixture of) chain extender(s) comprising a ‘non-stacking’ chain extender like cyclohexanedimethylol, neopentylglycol, MPdiol etc. to control crystallinity. In the current invention only ‘stacking’ chain extenders are used in an otherwise identical composition, resulting -unsurprisingly- in a more crystalline material with a higher modulus and melting temperature. It is also said that these materials are easier to compound with e.g. fire retardants.
Even if this idea were formally ‘new’ I doubt its inventiveness and therefore its patentability.

The famous ISOPLAST(TM) nail

1 Comment
by Gerhard Bleys on May 12, 2017  •  Permalink
Posted in Thermoplastics
Tagged , , , , , , ,

Posted by Gerhard Bleys on May 12, 2017

https://purpatents.com/2017/05/12/crystalline-high-hardblock-tpu/

Classic PU Patent of the Month: Upjohn’s “Isoplast®” (1981)

Title: Polyurethane prepared by reaction of an organic polyisocyanate, a chain extender and an isocyanate-reactive material of m.w. 500-20,000 characterized by the use of only 2-25 percent by weight of the latter material

 Number/Link: US4376834

Applicant/Assignee: Upjohn

Publication date: 15-03-1983

“Gist”: Very high hardblock TPU from MDI and chain extenders.

Why it is interesting: “Isoplast” is a so-called engineering thermoplastic useful in niche applications where high impact strength and high chemical resistance are required. The material can be clear or reinforced and can also be used in fiber-reinforced composites.  Currently the trademark is owned by Lubrizol who acquired it from Dow who in turn bought it from Upjohn in the 1980s.  Isoplast is made from 4,4′ MDI and a mixture of chain extenders selected from MEG,DEG, neopentyl glycol, 1,4-cyclohexanedimethanol etc. The choice of chain extenders controls the crystallinity/glassiness of the polymer.  A few percent of high mole weight polyol may be added to improve impact resistance. A very interesting material with interesting melt-flow characteristics because of its depolymerization and repolymerization behaviour during processing.

Screw from reinforced Isoplast

Screw from reinforced Isoplast

2 Comments
by Gerhard Bleys on May 23, 2014  •  Permalink
Posted in Classic PU Patent of the month, Thermoplastics
Tagged , , , , , , , ,

Posted by Gerhard Bleys on May 23, 2014

https://purpatents.com/2014/05/23/classic-pu-patent-of-the-month-upjohns-isoplast-1981/

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