All posts tagged comfort

Controlling the Tg of Viscoelastic Flexible Foams

Title: ADDITIVE FOR ADJUSTING THE GLASS TRANSITION TEMPERATURE OF VISCO-ELASTIC POLYURETHANE SOFT FOAMS

 Number/Link: WO2013/131710

Applicant/Assignee: Evonik

Publication date: 12-09-2013 (German)

“Gist”: Use of the di-salt of malic acid to fine-tune the Tg of visco flex foams.

Why it is interesting: The comfort properties of viscoelastic (“memory”) foams are to a large extend controlled by the glass transition temperature of the softblock, which in turn is controlled by NCO index, softblock molecular weight, crosslink density etc. Changing these parameters can be complex however because other properties -like airflow- are affected as well. This invention teaches the surprising effect of the di-sodium-salt of malic acid (hydroxybutanedioic acid) on the Tg of these foams. Apparently a small amount of the compound has a large effect on the Tg and can therefore be used to adjust the Tg without affecting other properties to a large extend.  E.g. about 0.1 php of the salt drops the Tg with 5.5°C, by comparison 0.1 php butanol lowers the Tg only by 0.3°C.

Malic Acid

Malic Acid

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by Gerhard Bleys on September 17, 2013  •  Permalink
Posted in Flexible Foams
Tagged , , , , ,

Posted by Gerhard Bleys on September 17, 2013

https://purpatents.com/2013/09/17/controlling-the-tg-of-viscoelastic-flexible-foams/

Can NOPs Rejuvenate Hot Cure Moulding?

Title: POLYOLS SUITABLE FOR HOT MOLDED FOAM PRODUCTION WITH HIGH RENEWABLE RESOURCE CONTENT

 Number/Link: US2013/210951

Applicant/Assignee: Bayer

Publication date: 15-08-2013 (priority PCT)

“Gist”: Castor oil based polyols designed for hot cure flexible foam allow for higher renewable content.

Why it is interesting: In the recent years there has been a growing use of renewable-resource based polyols in flexible foam production. However, because the current moulded flexible foam industry is dominated by the so-called “cold cure” process which typically needs highly reactive polyols, the maximum amount of renewables is usually limited to about 10% of the polyol. Bayer have now developed a natural oil based polyol specifically for hot cure moulding. The polyol of the invention is based on castor oil, EO, PO and a DMC catalyst such that the total amount of EO is 20 to 30% and the total amount of primary OH is between 35-45%.  When used in a hot cure moulding process the polyol allows for at least 30% (on the polyol) of renewables with foams having properties similar to conventional hot cure foams.

Major Component of Castor Oil

Major Component of Castor Oil

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by Gerhard Bleys on August 21, 2013  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , , , ,

Posted by Gerhard Bleys on August 21, 2013

https://purpatents.com/2013/08/21/can-nops-rejuvenate-hot-cure-moulding/

Reducing aldehyde emissions from flexible foams

Title: POLYURETHANE FOAMS WITH DECREASED ALDEHYDE EMISSIONS, A PROCESS FOR PREPARING THESE FOAMS AND A METHOD FOR DECREASING ALDEHYDE EMISSIONS IN POLYURETHANE FOAMS

 Number/Link: WO2013116092

Applicant/Assignee: Bayer

Publication date: 8-08-2013

“Gist”: Use of small amounts of hexamethylenediisocyanate trimer or small amounts of “PHD” polyols result in reduced aldehyde emissions from flex foams.

Why it is interesting: Reduction of VOC emissions and especially emissions of formaldehyde and acetaldehyde are an important issue for the polyurethane flexible foam industry, especially for bedding and automotive applications. This invention teaches two “tricks” to help solve the problem.  To a (preferably) TDI-based flex foam formulation which comprises at least one SAN or PIPA filled polyol, 0.5-3 pbw of trimerized hexamethylene diisocyanate is added on 100 pbw of the isocyanate.  Alternatively 2-3 pbw of PHD polyol is added on 100 pbw of the iso-reactive component. In the art “PHD polyol” usually stands for a polyurea ‘filled’ polyol (polyharnstoff dispersion), but in this case it stands for polyhydrazodicarnbonamide filled polyols. These PHD polyols are prepared by reacting a hydrazine with an isocyanate (pref TDI80) in a base polyol, so they are actually a subset of ‘conventional’ PHD dispersions.  The patent application is a bit confusing in this respect.

Hydroazodicarbonamide

Hydrazodicarbonamide

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by Gerhard Bleys on August 13, 2013  •  Permalink
Posted in Flexible Foams
Tagged , , , , , , ,

Posted by Gerhard Bleys on August 13, 2013

https://purpatents.com/2013/08/13/reducing-aldehyde-emissions-from-flexible-foams/

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