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Semi-rigid polyurethane foam used in packaging

  • US 4,087,389 A
  • Filed: 04/19/1976
  • Issued: 05/02/1978
  • Est. Priority Date: 04/19/1976
  • Status: Expired due to Term
First Claim
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1. A semi-rigid polyurethane foam prepared from a reaction mixture having an over-all index from about 30 to about 60, which mixture comprises:

  • a. a polyether polyol characterized by (1) a molecular weight of at least 4,000, (2) a polyhydroxy alcohol nucleus having a functionability of 2-4, (3) polyoxyalkylene chain segments attached to said nucleus and (4) a ratio of primary to secondary hydroxy groups ranging from about 1;

    1 to about 6;

    1.b. a polymeric polyisocyanate,c. water in a proportion of about 12-28 parts per every 100 parts by weight of total polyol in said mixture,d. a halogenated hydrocarbon foaming agent in a proportion of about 30-60 parts per every 100 parts by weight of total polyol in said mixture,e. an amine catalyst, andf. a non-hydrolyzable silicon-based surfactant in a proportion of about 1.5-3.2 parts per every 100 parts by weight of total polyol in said mixture.

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