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US 6,586,487 B1Granted
Low-density, water blown polyurethane foams for energy-absorbing applications
AssigneeBayer Aktiengesellschaft
InventorsNeil H. Nodelman, David D. Steppan, Alan D. Bushmire, William E. Slack
Life of this patent
Estimating the term…
Abstract
A method for making an energy-absorbing foam having a density that is less than about 7 pcf that exhibits excellent strength properties and that is particularly suitable for automobile bumper applications. The invention is also directed to the energy-absorbing foam made with the method.
Claims11
A method for making an energy-absorbing foam having a density that is less than about 7 pcf comprising the steps of reacting:
- (a) a polylsocyanate component comprising a member selected from the group consisting of polymeric diphenylmethane diisocyanate, mixtures of polymeric diphenylmethane diisocyanate and diphenylmethane diisocyanate, mixtures of polymeric diphenylmethane dilsocyanate and allophanate-modified diphenylmethane diisocyanate;
- with
- (b) a polyol component comprising
- (1) from about 12 to about 45 parts by weight of a diol having a molecular weight that is less than 300;
- (2) a crosslinker component having a functionality that is greater than 2, a molecular weight ranging from about 92 to about 1000, wherein the OH equivalent of the diol to the OH equivalent of the crosslinker is from about 1 to about 10;
- (3) from about 40 to about 75 parts of a non-filled polyether component having a functionality of from about 1.5 to about 4 and a molecular weight of from about 2000 to about 12,000;
- (4) from about 0.1 to about 3.0 parts of a cell-opening surfactant of the formula M*Dx D″y M*
- in which
- M* represents (CH3)3 SiO1/2 or R(CH3)2 SiO1/2,
- D represents (CH3)2 SiO2/2, and
- D″ represents (CH3)(R)SiO2/2,
- wherein x is 81-220, y is 8-40 and D/D″+M″)≦10, in which M″ represents R(CH3)2 SiO1/2;
- R represents a polyether-containing substituent derived from a blend of certain polyethers selected from two different groups in which the average molecular mass is 1100-1800;
- (5) from about 1 to about 3 parts water, based on 100 parts of the polyol component, wherein the amounts of components (1), (2), (3) and (4) total 100 parts;
- and
- (6) a tertiary amine catalyst in an amount about 0.2 to about 3.0 parts.
13 more elements
An energy-absorbing foam comprising the reaction product of:
- (a) a polyisocyanate component comprising a member selected from the group consisting of polymeric diphenylmethane diisocyanate, mixtures of polymeric diphenylmethane diisocyanate and diphenylmethane diisocyanate, and mixtures of polymeric diphenylmethane diisocyanate and allophanate-modified diphenylmethane diisocyanate;
- and
- (b) a polyol component comprising
- (1) from about 12 to about 45 parts by weight of a diol having a molecular weight that is less than 300;
- (2) a crosslinker component having a functionality that is greater than 2, a molecular weight ranging from about 92 to about 1000, wherein the OH equivalent of the diol to the OH equivalent of the crosslinker is from about 1 to about 10;
- (3) from about 40 to about 75 parts of a non-filled polyether component having a functionality of from about 1.5 to about 3.5 and a molecular weight of from about 2000 to about 12,000;
- (4) from about 0.1 to about 3.0 parts of a cell-opening surfactant of the formula M*Dx D″y M*
- in which
- M* represents (CH3)3 SiO1/2 or R(CH3)2 SiO1/2,
- D represents (CH3)2 SiO2/2, and
- D″ represents (CH3)(R)SiO2/2,
- wherein x is 81-220, y is 8-40 and D/(D″+M″)≦10, in which M″ represents R(CH3)2 SiO1/2;
- R represents a polyether-containing substituent derived from a blend of certain polyethers selected from two different groups in which the average molecular mass 1100-1800;
- (5) from about 1 to about 3 parts water, based on 100 parts of the polyot component, wherein the amounts of components 1), 2), 3) and 4) total 100 parts;
- and
- (6) a tertiary amine catalyst in an amount about 0.2 to about 3.0 parts.
13 more elements
Dependencies are inferred from the claim text.