Polymer polyols with ultra-high solids contents
AssigneeBayer MaterialScience AG
InventorShriniwas S. Chauk
Life of this patent
Estimating the term…
Abstract
The present invention relates to ultra-high solids content polymer polyols which have good filterability while maintaining a reasonable viscosity, and to a process for the preparation of these ultra-high solids contents polymer polyols. These polymer polyols comprise the free-radical polymerization product of (A) a base polyol, (B) a pre-formed stabilizer, (C) at least one ethylenically unsaturated monomer, (D) at least one free-radical polymerization initiator, and (E) at least one chain transfer agent. The solids contents varies from 60% to about 85% by weight.
Claims25
A, stable, ultra-high solids polymer polyol composition, comprising the reaction product of:
- (A) a base polyol;
- (B) from 7.5% to 35% by weight, based on 100% by weight of the polymer polyol, of a high potency preformed stabilizer which comprises
- (1) a macromer or precursor which comprises an adduct of an alcohol corresponding to the average formula:
- A(OROX)≧1,
- wherein:
- A represents a polyvalent organic moiety which has a free valence ≧1,
- R represents the divalent residue comprising an alkylene oxide moiety,
- and
- X represents one or more of an organic moiety containing reactive unsaturation which is copolymerizable with A and hydrogen and one of such X is the organic moiety containing reactive unsaturation and the remaining X's are hydrogen;
- (2) at least one free-radically polymerizable ethylenically unsaturated monomer,
- (3) a free-radical initiator,
- and
- (4) a liquid diluent comprising a monol;
- and
- (C) at least one ethylenically unsaturated monomer;
- in the presence of
- (D) at least one free-radical polymerization initiator;
- and
- (E) a chain transfer agent;
- wherein the polymer polyol has a solids content greater than 60% by weight, and the polymer polyol has a kinematic viscosity less than or equal to (X e[−4.5×LN(1−(Y/100))]) wherein:
- X:
- represents the kinematic viscosity of the base polyol,
- Y:
- represents the total solids content expressed as weight percent,
- LN:
- represents the logarithm to natural base,
- and the polymer polyol has product stability such that essentially 100% passes through a 150 mesh screen and at least about 99% passes through a 700 mesh screen.
A process for preparing a stable, ultra-high solids polymer polyol, comprising:
- (1) free-radically polymerizing:
- (A) a base polyol,
- (B) from 7.5% to 35% by weight, based on 100% by weight of the polymer polyol, of a high potency preformed stabilizer which comprises
- (1) a macromer or precursor which comprises an adduct of an alcohol corresponding to the average formula:
- A(OROX)≧1,
- wherein:
- A represents a polyvalent organic moiety which has a free valence ≧1,
- R represents the divalent residue comprising an alkylene oxide moiety,
- and
- X represents one or more of an organic moiety containing reactive unsaturation which is copolymerizable with A and hydrogen and one of such X is the organic moiety containing reactive unsaturation and the remaining X's are hydrogen;
- (2) at least one free-radically polymerizable ethylenically unsaturated monomer,
- (3) a free-radical initiator,
- and
- (4) a liquid diluent comprising a monol;
- and
- (C) at least one ethylenically unsaturated monomer, in the presence of:
- (D) at least one free-radical polymerization initiator,
- and
- (E) a chain transfer agent;
- wherein the polymer polyol has a solids content greater than 60% by weight, and the polymer polyol has a kinematic viscosity less than or equal to (X e[−4.5×LN(1−Y/100))]) wherein:
- X:
- represents the kinematic viscosity of the base polyol,
- Y:
- represents the total solids content expressed as weight percent,
- LN:
- represents the logarithm to natural base,
- and the polymer polyol has product stability such that essentially 100% passes through a 150 mesh screen and at least about 99% passes through a 700 mesh screen.
Dependencies are inferred from the claim text.