Breathable open cell urethane polymers
AssigneeFoamex L.P.
InventorRocco P. Triolo
Life of this patent
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Abstract
A breathable or air-permeable, open cell, flexible urethane polymer suitable for use in cushions is formed from a foam-forming composition containing from about 0.5 to 2.0 parts by weight of butyl oleate, based upon 100 parts by weight polyol, under controlled pressure conditions maintained at or, preferably, below atmospheric pressure. The pressure during foaming is maintained in the range of about 0.5 to 1.0 bar, preferably 0.5 to 0.9 bar. Resultant air permeability is unexpectedly significantly increased over urethane polymers of equivalent composition. Other polymer properties are enhanced.
Claims12
A method for producing a breathable, flexible polyurethane foam, comprising the steps of:
- (1) preparing a foam-forming composition from (a) a polyol selected from the group consisting of polyether polyols and mixtures of polyether polyols with polymer polyols, and (b) from about 40 to 70 parts by weight, based upon 100 parts by weight polyol, of a polyisocyanate, (c) a blowing agent;
- and (d) from about 0.5 to 2.0 parts by weight, based upon 100 parts by weight polyol, of butyl oleate;
- and
- (2) forming the polyurethane foam from the foam-forming composition under controlled pressure conditions maintained at or below atmospheric pressure.
A composition for producing a breathable, flexible polyurethane foam when foamed at controlled pressures maintained at or below atmospheric pressure, comprising:
- a polyol selected from the group consisting of polyether polyols and mixtures of polyether polyols with polymer polyols;
- from about 40 to 70 parts by weight, based upon 100 parts by weight polyol, of a polyisocyanate or mixture of polyisocyanates;
- from about 2 to 6 parts by weight, based upon 100 parts by weight polyol, of a blowing agent;
- and
- from about 0.5 to 2.0 parts by weight based upon 100 parts by weight polyol, of butyl oleate.
Dependencies are inferred from the claim text.