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.
2,2,4-trimethyl-1,2-dihydroquinoline
Innovation in Polyurethanes 