All posts tagged Environment

Scorch-Proof Polyurethane Foams

Patent Title:  LOW EMISSIONS SCORCH INHIBITOR FOR POLYURETHANE FOAM

 Number/Link: WO2018/064521

Applicant/Assignee:  Vanderbilt Chemicals

Publication date: 5 April 2018

“Gist”: A synergistic mixture of antioxidants prevents scorch

Why it is interesting: “Scorch” is a discolouration of the center of (especially low-density flexible) polyurethane slabstock foams as a consequence of excessive heat build-up during production. It is believed to be the result of free-radical reactions of foaming components and additives, like the dimerisation of BHT – a common antioxidant. According to this invention the combination of three to (optionally) 5 specific antioxidants show an unexpected synergy towards prevention of scorch. The inventive composition consists of 2,2,4-trimethyl-1,2-dihydroquinoline, a lactone (e.g. 3-alkyl- benzofurane-2-one), a phenolic compound (e.g. an alkylated monophenol) and optionally a tocopherol (a vitamine E-type phenolic compound) and a phosphite compound.  The composition is said to have the added advantage of showing low volatile chemical emissions.

quinoline

2,2,4-trimethyl-1,2-dihydroquinoline

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by Gerhard Bleys on April 13, 2018  •  Permalink
Posted in Flexible Foams
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on April 13, 2018

https://purpatents.com/2018/04/13/scorch-proof-polyurethane-foams/

PIR-Oxazolidone Foams from Natural Oils

Patent Title: METHOD FOR MANUFACTURING A POLYURETHANE-MODIFIED FOAM, FOAM OBTAINED, AND USES

Number/Link: US2018/0030196

Applicant/Assignee:  Soprema et al.

Publication date: 1 February 2018

“Gist”: Unsaturated natural oils are epoxidized and reacted with an excess of isocyanate in the presence of a blowing agent.

Why it is interesting: Conventionally natural oils are incorporated into polyurethanes by first converting them to polyols (“NOPs”) by hydroformylation or epoxidation and ring opening and then reacting the NOPs with isocyanates. According to this invention the natural oils (preferably extracted from microalgae) are epoxidized and then mixed and heated with a (e.g. 3:1) excess of isocyanate (e.g. polymeric MDI) in the presence of a blowing agent (e.g. isopentane). It is said that oxazolidone rings from the isocyanate-epoxy reaction will form at the same time as isocyanurate rings and homopolymerized epoxides. The foams are said to be useful for thermal insulation applications.

oxazolidone

Formation of oxazolidone rings according to the invention

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by Gerhard Bleys on February 9, 2018  •  Permalink
Posted in Rigid Foams
Tagged , , , , , , , , , , , ,

Posted by Gerhard Bleys on February 9, 2018

https://purpatents.com/2018/02/09/pir-oxazolidone-foams-from-natural-oils/

Polyurethanes from Alpha Glucan

Patent Title: POLYURETHANE POLYMERS COMPRISING POLYSACCHARIDES

 Number/Link: WO2018/017789

Applicant/Assignee:  Du Pont

Publication date: 25 january 2018

“Gist”: Polyurethanes containing poly alpha 1,3-glucan

Why it is interesting: The invention is related to the preparation of different types of polyurethanes comprising poly alpha 1,3-glucan, which is a polymeric D-glucose having alpha 1,3 glycosidic bonds (as opposed to most natural glucose polymers which show α or β 1,4 glycoside linkages). Alpha 1,3 glucan can be prepared by enzymatic polymerization using sucrose and a glycosyltransferase. The glucan can be mixed with polyols and reacted with isocyanates to prepare polyurethanes.  Many examples are given ranging from PUDs, films, flexible foams to TPUs.

glucan

Poly alpha 1,3-glucan

 

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by Gerhard Bleys on January 29, 2018  •  Permalink
Posted in Adhesives-Coatings, dispersions, Elastomers, Flexible Foams, Polyols, Thermoplastics
Tagged , , , , , ,

Posted by Gerhard Bleys on January 29, 2018

https://purpatents.com/2018/01/29/polyurethanes-from-alpha-glucan/

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