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Semi-rigid polyurethane foam used in packaging
| Details |
Inventors: Coppola, Pasquale J.;
Assignee: Olin Corporation (New Haven, CT)
Primary Examiner: Czaja; Donald E.
Assistant Examiner: Fletcher; H. H.
Attorney, Agent or Firm: Feltovic; Robert J., O'Day; Thomas P., Iskander; F. A.
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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DETAILED DESCRIPTION What is claimed is: 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, 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.
2.
The polyurethane foam of claim 1 wherein said polyether polyol is a triol having a molecular weight of about 4,500-7,500 and a ratio of primary to secondary hydroxyl groups ranging from about 1.
5:1 to about 5:1.
3.
The polyurethane foam of claim 2 wherein said polymeric polyisocyanate is polymethylene polyphenylisocyanate having an average NCO functionability of about 2.
1-3.
5.
4.
The polyurethane foam of claim 3 wherein a.
said polyether polyol is an oxypropylated then oxyethylated aliphatic triol having a ratio of primary to secondary hydroxyl groups from about 2:1 to about 4.
5:1, b.
said amine catalyst is a tertiary amine, and c.
said halogenated hydrocarbon foaming agent is trichloromonofluoromethane.
5.
The polyurethane foam of claim 4 wherein per every 100 parts by weight of total polyol in said mixture, there are employed: a.
about 14-24 parts of said water, b.
about 38-52 parts of said trichloromonofluoromethane, and c.
about 1.
8-3.
0 parts of said silicon-based surfactant.
6.
The polyurethane foam of claim 5 wherein said index ranges from about 35 to about 55 and said polymethylene polyphenylisocyanate has an average NCO functionability of about 2
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Molecular Biology 
