Polyurethane prepn - from polyisocyanates, polyether-, polyesterpolyols and transesterified polyols

    公开(公告)号:DE2457726A1

    公开(公告)日:1976-06-16

    申请号:DE2457726

    申请日:1974-12-06

    Applicant: BASF AG

    Abstract: (Cellular)polyurethanes are prepd. from a mixt. of A) >=1 polyisocyanate, B) >=1 polyhydroxy cpd. of mol. wt. 500-7,000 chosen from polyether-and polyester-polyols and opt. D) other conventional additives, the novelty being that a polymer (C) is included in the mixt.; C) is the reaction prodt. of a polymer contg. >=1 gp. capable of (trans)esterification and a polyhydroxy cpd. chosen from polyester- or polyether-polyols of mol. wt. 200-7,000 with formation of at least a partial ester like bond. Polymers contg. covalently bonded polyhydroxy cpds., useful in polyurethane chemistry are easily obtd. cf. prior art where either a) polyhydroxy cpds. and polyisocyanates were reacted or b) in situ free radical graft polymers contg. polyetherpolyols grafted over C-C bonds were used. Physical props. e.g., load capacity and low temp. flexibility are also improved. As flexible or rigid, foams, elastomers or coatings. The foams may be used as shoe soles, or in the automobile industry.

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