Viscoelastic foam layer and composition

Details Viscoelastic foam layer and composition Viscoelastic foam layer and composition

2006-07-18

2006-07-18

Cooney, Jr., John M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S125000, C521S126000, C521S127000, C521S128000, C521S129000, C521S130000, C521S159000, C521S163000, C521S164000, C521S170000, C521S174000, C521S131000

Reexamination Certificate

active

07078443

ABSTRACT:
A viscoelastic foam is provided having an amine-based polyol system to impart strength, recoverability and endurance to the foam, and an appropriately selected trifunctional non-amine-based polyol system to provide flexibility to the foam. The combination of amine-based and non amine-based polyols provides a viscoelastic semi-rigid foam with excellent impact and recovery properties, recovering to substantially 100% of its initial volume and shape following an impact, yet with high rigidity and stiffness so that it is effective at absorbing high as well as low-energy impacts. A method of making the above viscoelastic foam is also provided. In a preferred embodiment, the foam is made using an allophanate-modified MDI prepolymer in order to provide the isocyanate in liquid form at standard temperature and pressure in order to simplify the production of the invented viscoelastic foams.

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