Semi-flexible foam polymer used in packaging
AssigneeOlin Corporation
InventorRobert J. Raynor
Life of this patent
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Abstract
A select, low density semi-flexible foam polymer composition is prepared from a very select reaction mixture which is characterized by a foaming agent which consists essentially of water and is substantially free of fluorinated hydrocarbon compounds, and a relatively low reaction mixture NCO/OH index of from about 20 to about 70. The foam polymer composition is particularly useful in packaging fragile or shock-sensitive objects.
Claims9
A semi-flexible foam polymer having a density of from about 0.35 to about 1 pound per cubic foot, said polymer being prepared from a reaction mixture having an over-all index of about 20 to about 70, wherein said reaction mixture comprises:
- (a) a polymeric polyisocyanate having an average functionality of about 2 to about 3.5;
- (b) a polyether polyol having 2-4 hydroxy groups and a molecular weight from about 500 to about 3,000, said polyether polyol being employed in a proportion of about 10 to about 70 parts per every 100 parts by weight of total polyisocyanate in said reaction mixture;
- (c) a foaming agent which consists essentially of water and is substantially free of fluorinated hydrocarbon compounds, said foaming agent being employed in a proportion of about 7 to about 30 parts per every 100 parts of total polyisocyanate in said reaction mixture;
- (d) an amine catalyst;
- and
- (e) a silicon-based surfactant.
A semi-flexible foam polymer having a density of from about 0.35 to about 0.5 pound per cubic foot, said polymer being prepared from a reaction mixture having an over-all index of about 30 to about 50, wherein reaction mixture comprises:
- (a) polymethylene polyphenylisocyanate having a functionality of about 2.4-2.8;
- (b) an oxypropylated then oxyethylated triol having a molecular weight of about 800-2,000, said triol being employed in a proportion of about 20 to about 50 parts per every 100 parts by weight of total polyisocyanate in said reaction mixture;
- (c) a foaming agent which consists essentially of water and is substantially free of fluorinated hydrocarbon compounds, said foaming agent being employed in a proportion of about 12 to about 20 parts per every 100 parts by weight of total polyisocyanate in said reaction mixture;
- (d) a catalytic proportion of a tertiary amine catalyst;
- and
- (e) a non-hydroxyzable silicon-based surfactant in a proportion of about 0.4 to about 4 parts per every 100 parts by weight of total polyisocyanate in said reaction mixture.
Dependencies are inferred from the claim text.