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

NOPs from GMOs

Patent Title: Low Polyunsaturated Fatty Acid Oils and Uses Thereof

 Number/Link: US20160194584

Applicant/Assignee: Solazyme

Publication date: 7-07-2016

Gist”: Natural oil polyols from genetically modified organisms

Why it is interesting: Natural oils usually contain significant (and variable) amounts of polyunsaturated fatty acids, i.e. fatty acids with more than one double bond in the backbone. Soybean oil for example contains up to 60% PUFAs that can easily engage in side reactions like autooxidation and polymerization, resulting in side products that contaminate the oil – and therefore the polyols derived from them.  According to this (299 page) application, oils containing >85% oleic acid and very low PUFA concentration can be made from certain genetically modified microalgae. Polyols derived from these oils by hydroxylation can be used to prepare polyurethane foams with reduced discolorouration, reduced odour, improved reproducibility and improved physical properties as compared to foams based on conventional NOPs.

Triglicerid with PUFA

Trigliceride with PUFA