All posts tagged bio-based materials

Making a Better NOP-based Flexible Foam

Title: Additives For Improving Natural Oil Based Polyurethane Foam Peformance

 Number/Link: US2013/0065978

Applicant/Assignee: Air Products

Publication date: 14-03-2013

“Gist”: Incorporating a small amount of cyanoguanidine into a NOP-based flexible foam improves airflow and humid ageing.

Why it is interesting: Now that natural oil polyols (NOPs) are becoming mainstream in flexible polyurethane foams (at least in the patent literature), it is to be expected that specific catalysts, surfactants and other additives will be developed for these systems.  Air Products claims to improve air flow and humid ageing properties of NOP-based foams by adding small amounts ( about 0.05 parts per 100 polyol) of solutions (in e.g. DMSO) of guanidine or its derivatives like cyanoguanidine or guanidinehydrochloride salt  to the formulation.  While it is not immediatly clear why this should work, the effect seems to be real.

2-cyanoguanidine

2-cyanoguanidine

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by Gerhard Bleys on March 19, 2013  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , ,

Posted by Gerhard Bleys on March 19, 2013

https://purpatents.com/2013/03/19/making-a-better-nop-based-flexible-foam/

Polyurethane Foams from Sugar

Title: Sugar-Based Polyurethanes, Methods for Their Preparation, and Methods of Use Thereof

 Number/Link: US2013030067

Applicant/Assignee: Imperial Sugar Co.

Publication date: 31-01-2013

“Gist”: Very low density semi-rigid foams are produced from sucrose syrup and MDI.

Why it is interesting: Open celled foams are prepared from sucrose, water, MDI and preferably a  flame retardant at an NCO index from 20-60 (preferred). A number of examples is given of foams with densities 0f 8 kg/m3 (0.5 pcf) which is quite low.  Mechanical an heat insulation properties are probably not very good but the foams are very ‘green’ and cheap. Useful as sprayable acoustic foams?

Sucrose

Sucrose

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by Gerhard Bleys on February 5, 2013  •  Permalink
Posted in Rigid Foams
Tagged , , , ,

Posted by Gerhard Bleys on February 5, 2013

https://purpatents.com/2013/02/05/polyurethane-foams-from-sugar/

Thermoplastic Polyurethanes from Polyesters Based on “Bio”-Propanediol.

Title: THERMOPLASTIC POLYURETHANE WITH REDUCED TENDENCY TO BLOOM FROM A BIO-BASED GLYCOL

 Number/Link: WO2012173911

Applicant/Assignee: Lubrizol

Publication date: 20-12-2012

“Gist”: TPUs with less tendency to “bloom” are prepared from diisocyanate, diol chain extender and a polyester polyol based on 1,3-propanediol and adipic acid.

Why it is interesting:  “Blooming” is an undesirable effect where TPU  becomes ‘hazy’ or ‘fogged’ as a consequence of non-reacted species exuding to the surface. It is known that cyclic esters, which are a by-product of polyester polyol production, contribute greatly to this effect. It is also known that 1,3-propanediol and 1,6-hexandiol based polyesters show less cyclic esters than e.g. DEG based polyesters (see p4 of WO2012125353 to Stepan). So, while still interesting, this case is not surprising.

1,3-propanediol

1,3-propanediol

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by Gerhard Bleys on January 2, 2013  •  Permalink
Posted in Elastomers
Tagged ,

Posted by Gerhard Bleys on January 2, 2013

https://purpatents.com/2013/01/02/thermoplastic-polyurethanes-from-polyesters-based-on-bio-propanediol/

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