Loading patent…
AssigneesAerofoam Industries Proprietary Limited, Polyeth Marketing Proprietary Limited
InventorsEdward T. Hill, Bernard L. Kaplan, Paul V. Farkas
Estimating the term…
The invention is concerned with the preparation of polyurethane compositions in which the deleterious effect of gaseous by-products formed in the reaction is minimized. This is achieved by the use of coupling reagents which incorporate a steric hindrance function. The latter does not interfere with the normal coupling reactions between the coupling agent and polymer matrix and filler material but it does prevent such reaction between the coupling agent and filler material as would cause release of low molecular weight compounds occluded by the filler. Since the release of low molecular weight compounds is avoided, the formation or evolution of gases which give rise to unwanted cellularity of the cured composition is at least minimized.
A method of making a polyurethane composition from polyurethane forming reactants, a filler material part at least of which is selected to occlude low molecular mass compounds in the reaction mass, and a coupling reagent for effecting physical or chemical bonding of the filler material and polyurethane compound formed in the reaction, characterised in that the coupling reagent incorporates a steric hindrance function operative to protect the filler material against release of occluded molecules.
The method of any one of the above claims in which the hydroxyl containing polyurethane forming reactant comprises a mixture of
A polyurethane composition comprising a polyurethane compound, a filler material occluding low molecular mass compounds in the composition, and a coupling reagent effecting physical or chemical bonding of the filler material and polyurethane compound, characterised in that the coupling reagent incorporates a steric hindrance function operative to protect the filler material against release of occluded molecules.
Dependencies are inferred from the claim text.