Semi-rigid polyurethane foam used in packaging
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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Abstract
A select semi-rigid polyurethane foam composition is described for use in packaging fragile or shock-sensitive objects. The foam composition is prepared from a very select reaction mixture which is characterized by high levels of water and an organic foaming agent, and a relatively low reaction mixture NCO/OH index of from about 30 to about 60.
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14 Claims
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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:
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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, and f. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification