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US 2020/0347280 A1Published application
Polyurethane compositions with low exposure to free monomeric mdi isocyanate content during spray application
AssigneeBASF SE
InventorsTodd W. Wishneski, Megan Warner Szyndler, David K. Bower, Marcus J. Hunter, Colin A. Moore
Life of this patent
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Abstract
Sprayable polyurethane compositions, in the form of spray polyurethane foams or low rise adhesives, when spray applied in the area of spray application at any given time, having monomeric MDI contents in the spray application area of no more than 20 parts per billion as measured in accordance with PEL Method 47 and having a viscosity of from 100 to 3,000 cP at 25° C. according to ASTM D2196.
Claims28
A sprayable polyurethane foam (SPF) composition comprising:
- an isocyanate component having free isocyanate-functional groups and comprising, based on the total weight of the isocyanate component:
- from 50 to 100 weight percent of an isocyanate-containing compound comprising polymeric diphenylmethane diisocyanate (PMDI), wherein a monomeric diphenylmethane diisocyanate (monomeric MDI) content of said PMDI ranges from 10 to 90 weight percent based on 100 parts by weight of said PMDI, and
- from 0 to 50 weight percent of a first isocyanate-reactive component having one or more hydroxyl-functional groups per molecule reactive with said isocyanate groups of said isocyanate component;
- and
- a second isocyanate-reactive component having one or more hydroxyl-functional groups reactive with said free isocyanate-functional groups of said isocyanate component, wherein the ratio of free isocyanate-functional groups of said isocyanate component to said hydroxyl-functional groups of said second-reactive isocyanate-reactive component ranges from 0.25:1 to 3.0:1, said second isocyanate-reactive component comprising, based on the total weight of the second isocyanate-reactive component:
- from 20 to 90 weight percent of a hydroxyl-functional polymer component having an average hydroxyl functionality, per molecule, of from 1.5 to 7, said hydroxyl-functional polymer component comprising, based on the total weight of the hydroxyl-functional polymer component:
- from 0 to 40 weight percent of a fire retardant component,
- from 1 to 10 weight percent of a silicone surfactant,
- from 0 to 20 weight percent of a diamine,
- from 0.5 to 15 weight percent of a catalyst, and
- from 0 to 25 weight percent of a first blowing agent;
- and
- wherein the viscosity of the sprayable polyurethane foam composition, when spray applied in the area of spray application, is from 100 to 3,000 cP at 25° C. according to ASTM D2196, and
- wherein the monomeric MDI content of the sprayable polyurethane composition, when spray applied in the area of spray application, is no more than 50 parts per billion in the area of spray application in any time period as measured in accordance with PEL Method 47.
11 more elements
A sprayable low rise adhesive (LRA) composition comprising:
- an isocyanate component having free isocyanate-functional groups and comprising, based on the total weight of the isocyanate component:
- from 50 to 100 weight percent of an isocyanate-containing compound comprising polymeric diphenylmethane diisocyanate (PMDI), wherein a monomeric diphenylmethane diisocyanate (monomeric MDI) content of said PMDI ranges from 10 to 90 weight percent based on 100 parts by weight of said PMDI, and
- from 0 to 50 weight percent of a first isocyanate-reactive component having one or more hydroxyl-functional groups per molecule reactive with said isocyanate groups of said isocyanate component;
- and
- a second isocyanate-reactive component having one or more hydroxyl-functional groups reactive with said free isocyanate-functional groups of said isocyanate component, wherein the ratio of free isocyanate-functional groups of said isocyanate component to said hydroxyl-functional groups of said second-reactive isocyanate-reactive component ranges from 0.75:1 to 3.0:1, said second isocyanate-reactive component comprising, based on the total weight of the second isocyanate-reactive component:
- from 25 to 90 weight percent of a hydroxyl-functional polymer component having an average of from 1.5 to 7 hydroxyl groups per molecule;
- from 0 to 5 weight percent of an ethylene diamine-initiated polyether polyol crosslinker having an average of 4 hydroxyl groups per molecule;
- from 0 to 10 weight percent of a glycerine-initiated or dipropylene glycol-initiated polyether polyol crosslinker having an average of 2 to 3 hydroxyl groups per molecule and having a weight average molecular weight ranging from 25 to 6,000 g/mol;
- from 0.5 to 5 weight percent of a silicone surfactant,
- from 25 to 75 weight percent of a primary amine, and
- from 0.15 to 20 weight percent of water,
- wherein the viscosity of the sprayable low rise adhesive composition, when spray applied in the area of spray application, is from 100 to 3,000 cP at 25° C. according to ASTM D2196, and
- wherein the monomeric MDI content of the sprayable low rise adhesive composition, when spray applied in the area of spray application, is no more than 50 parts per billion in the area of spray application in any time period as measured in accordance with PEL Method 47.
10 more elements
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Dependencies are inferred from the claim text.