Polymer polyols, processes for their preparation, and the use thereof to produce foams exhibiting resistance to combustion
AssigneeCovestro LLC
InventorsRick Adkins, Shriniwas Chauk, Jose Pazos
Life of this patent
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Abstract
Polymer polyols (“PMPOs”), processes for their production, and the use of such PMPOs, particularly in the production of flexible polyurethane foams. The PMPOs are produced using an ethylenically unsaturated composition that includes a crosslinker that results in crosslinks in the PMPO polymer particles that may decompose when exposed to flame temperatures. The PMPOs is capable of providing a flexible polyurethane foam that may exhibit combustibility resistance properties.
Claims20
A polymer polyol (PMPO) comprising polymer particles dispersed in a base polyol, wherein the polymer particles comprise a free radical polymerization reaction product of an ethylenically unsaturated composition comprising a compound of structure (I):
- in which:
- (i) R comprises an alkyl group, an aryl group, an alkylaryl group, or a cycloaliphatic group, each optionally containing a heteroatom;
- (ii) each X is independently a unit containing a urethane group, a urea group, an ester group, or a combination thereof;
- (iii) each Z is independently an alkyl group, an aryl group, an alkylaryl group, optionally containing a heteratom, that contains reactive unsaturation;
- and (iv) b has a value of at least 2;
- and wherein the compound of structure (I) is present in an amount of 0.1 to 10% by weight, based on total weight of components used to produce the PMPO.
A process for preparing a PMPO comprising free-radically polymerizing a reaction mixture comprising:
- (A) a base polyol;
- (B) a pre-formed stabilizer;
- (C) an ethylenically unsaturated composition;
- (D) a free-radical polymerization initiator;
- and, optionally, (E) a polymer control agent, wherein the ethylenically unsaturated composition comprises a compound of structure (I):
- in which:
- (i) R comprises an alkyl group, an aryl group, an alkylaryl group, or a cycloaliphatic group, each optionally containing a heteroatom;
- (ii) each X is independently a unit containing a urethane group, a urea group, an ester group, or a combination thereof;
- (iii) each Z is independently an alkyl group, an aryl group, an alkylaryl group, optionally containing a heteratom, that contains reactive unsaturation;
- and (iv) b has a value of at least 2;
- and wherein the compound of structure (I) is present in an amount of 0.1 to 10% by weight, based on total weight of components used to produce the PMPO.
Dependencies are inferred from the claim text.