Process for making visco-elastic foams, polyols blend and reaction system useful therefor
AssigneeHuntsman International LLC
InventorsAlain Parfondry, Jianming Yu
Life of this patent
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Abstract
The invention relates to a one-shot or prepolymer process for preparing a visco-elastic polyurethane foam by reacting a polyisocyanate composition with a polyol composition comprising b1) an EO-rich polyol; b2) a polyol with an EO content between 20-50% and a primary hydroxy content of at least 50%; b3) a polyol with an EO content between 10-20% and a primary hydroxy content of at least 50%; and b4) a polyalkyleneglycol; according to the following proportions: b1: 30-85 wt %, b2: 5-65 wt %, b3: 5-40 wt %, b4: 0-50 wt %. The invention also relates to reaction systems comprising the above components and to the polyol composition.
Claims10
A one-shot or prepolymer process for preparing a visco-elastic polyurethane foam at an NCO index of 70-120 comprising reacting:
- a) a polyisocyanate composition;
- b1) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-6, where the EO is present as tipped EO and/or random EO, the total EO content being at least 50% by weight;
- b2) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-6, where the EO is present as tipped EO and/or random EO, the total EO content being between 20-50% by weight, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups;
- b3) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxyl functionality of 2-6, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups, and having an EO content of from 10 to 20% by weight;
- b4) a polyalkyleneglycol having an average molecular weight from 100 to 1200;
- these polyols b1, b2, b3 and b4 being reacted according to the following proportions, based on the combined weights of b1, b2, b3 and b4, b1:
- 30-85 wt %, b2:
- 5-65 wt %, b3:
- 5-40 wt %, b4:
- 0-50 wt %;
- c) water;
- and
- d) additives and auxiliaries known per se;
- and where the polyisocyanate prepolymer has an NCO value above 20% in case the prepolymer process is used.
A polyol composition comprising b1) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-6, where the EO is present as tipped EO and/or random EO, the total EO content being at least 50% by weight;
- b2) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-6, where the EO is present as tipped EO and/or random EO, the total EO content being between 20-50% by weight, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups;
- b3) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxyl functionality of 2-6, having a primary hydroxy content of at least 50% calculated on the amount of primary and secondary hydroxyl groups and having an EO content of from 10 to 20% by weight;
- b4) a polyalkyleneglycol having an average molecular weight from 100 to 1200;
- these polyols b1, b2, b3 and b4 being present according to the following proportions, based on the combined weights of b1, b2, b3 and b4, b1:
- 30-85 wt %, b2:
- 5-65 wt %, b3:
- 5-40 wt %, b4:
- 0-50 wt %.
Dependencies are inferred from the claim text.