US4711912A — Polyisocyanurate foams from digestion products of…

Claim 1

Independent Claim 49 words

A polyisocyanurate foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1.

Claim 2

Dependent Claim 49 words

A polyisocyanurate foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1.

Claim 3

Dependent Claim 14 words

The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a polymethylene polyphenylisocyanate.

Claim 4

Dependent Claim 40 words

The polyisocyanurate foam of claims 1 or 2 wherein said polyalkylene terephthalate has a molecular weight greater than 15,000 and is digested in a polyol selected from the group consisting of diethylene glycol, dipropylene glycol, polyethylene glycol and polypropylene glycol.

Claim 5

Dependent Claim 13 words

The polyisocyanurate foam of claim 1 wherein said digesting polyol is diethylene glycol.

Claim 6

Dependent Claim 13 words

The polyisocyanurate foam of claim 1 wherein said polyalkylene terephthalate is polyethylene terephthalate.

Claim 7

Dependent Claim 60 words

The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a mixture of components of the formula ##STR4## wherein n is an integer from 0 to 8 inclusive, and said mixture has: (a) a functionality of 2.1 to 3.2, (b) an equivalent weight between 120 and 180, and (c) a viscosity at 25° C. between 150 and 2500 centipoises.

Claim 8

Dependent Claim 21 words

The polyisocyanurate foam of claim 1 wherein said digesting polyol is an aliphatic dihydric alcohol having 2 to 16 carbon atoms.

Claim 9

Dependent Claim 20 words

The polyisocyanurate foam of claims 1, 2 or 7 wherein said polyol mixture includes polyol added after the digestion reaction.

Claim 10

Dependent Claim 21 words

The polyisocyanurate foam of claims 1, 2 or 7 wherein said polyol mixture includes a diluent which is nonreactive to isocyanates.

Claim 11

Dependent Claim 34 words

The polyisocyanurate foam of claims 1, 2 or 7 wherein said polyol mixture contains about 5 to 40 percent by weight of said digesting polyol, based on the total weight of said polyol mixture.

Claim 12

Dependent Claim 26 words

The polyisocyanurate foam of claims 1, 2 or 7 wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is about 1.5:1 to 6:1.

Claim 13

Dependent Claim 43 words

The polyisocyanurate foam of claims 1 or 2 wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is about 1.5:1 to 6:1, and said digesting polyol is a member selected from the group consisting of diethylene glycol and polyoxyethylene glycols.

Claim 14

Dependent Claim 72 words

The polyisocyanurate foam of claims 1 or 2 wherein said digesting polyol is diethylene glycol and said polyol mixture is characterized by a viscosity in cps at 25° C. of about 700 to 8,000, a free diethylene glycol content of from about 10 to 30 percent by weight of said mixture, a hydroxyl number within a range of from about 400 to 550, and an acid number of about 0.2 to 10.

Claim 15

Dependent Claim 67 words

The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a polymethylene polyphenylisocyanate, said polyalkylene terephthalate is polyethylene terephthalate, said digesting polyol is diethylene glycol, the equivalent ratio of said polymethylene polyphenylisocyanate to said polyol mixture is about 1.5:1 to 6:1, and said polyol mixture contains about 20 to 30 percent by weight of said diethylene glycol, based on the total weight of said polyol mixture.

Claim 16

Dependent Claim 55 words

The polyisocyanurate foam of claim 1 which comprises the reaction product of a polymethylene polyphenylisocyanate, a fluorocarbon blowing agent, a trimerization catalyst, and a polyol mixture prepared by the digestion, with diethylene glycol or polyoxyethylene glycols, of polyalkylene terephthalate, the equivalent ratio of said polymethylene polyphenylisocyanate to said polyol mixture being about 1.5:1 to 6:1.

Claim 17

Dependent Claim 70 words

The polyisocyanurate foam of claim 15 wherein said digesting polyol is diethylene glycol and said polyol mixture is characterized by a viscosity in cps at 25° C. of about 700 to 8,000, a free diethylene glycol content of from about 10 to 30 percent by weight of said mixture, a hydroxyl number within a range of from about 400 to 550, and an acid number of about 0.2 to 10.

Claim 18

Dependent Claim 15 words

The polyisocyanurate foam of claims 15 or 16 wherein said polyalkylene terephthalate is polyethylene terephthalate.

Claim 19

Dependent Claim 23 words

The polyisocyanurate foam of claim 17 wherein sasid trimerization catalyst comprises a mixture of a tertiary amino phenol and an alkali metal carboxylate.

Claim 20

Dependent Claim 28 words

The polyisocyanurate foam of claim 18 wherein said trimerization catalyst comprises a mixture of 2,4,6-tris(dimethylaminomethyl) phenol and potassium-2-ethyl hexoate in an equivalent ratio of about 0.4:1 to 2.5:1.

Claim 21

Dependent Claim 54 words

A process for producing a polyisocyanurate foam comprising reacting together under foam-forming conditions an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1.

Claim 22

Dependent Claim 54 words

A process for producing a polyisocyanurate foam comprising reacting together under foam-forming conditions an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1.

Claim 23

Dependent Claim 60 words

A laminate comprising at least one facing sheet adhered to a polyisocyanurate foam which comprises the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1

Claim 24

Dependent Claim 60 words

A laminate comprising at least one facing sheet adhered to a polyisocyanurate foam which comprises the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1

Claim 25

Dependent Claim 14 words

The laminate of claim 21 wherein said polyisocyanurate foam is reinforced by glass fibers.

Claim 26

Dependent Claim 65 words

A process for producing a laminate comprising (a) contacting a facing sheet with a polyisocyanurate foam-forming mixture comprising an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1, and (b) foaming said foam-forming mixture..

Claim 27

Dependent Claim 65 words

A process for producing a laminate comprising (a) contacting a facing sheet with a polyisocyanurate foam-forming mixture comprising an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate with a polyol, wherein the equivalent ratio of said organic polyisocyanate to said polyol mixture is at least 1.5:1, and (b) foaming said foam-forming mixture..

Claim 28

Dependent Claim 103 words

A polyisocyanurate foam formed by reacting an organic polyisocyanate and a minor amount of a polyol mixture in the presence of a blowing agent and, as a catalyst for said reaction, one or more catalysts known to catalyze the trimerization of isocyanates to form isocyanurates, and to catalyze the reaction of isocyanate groups with hydroxyl groups to form polyurethanes, wherein from about 1%-100% of the polyol mixture employed in said foam reaction consists of a digestion product obtained by digesting polyalkylene terephthalate in a digesting polyol selected from the class consisting of diols and triols haivng a molecular weight of from about 60-500.

Claim 29

Dependent Claim 103 words

A polyisocyanurate foam formed by reacting an organic polyisocyanate and a minor amount of a polyol mixture in the presence of a blowing agent and, as a catalyst for said reaction, one or more catalysts known to catalyze the trimerization of isocyanates to form isocyanurates, and to catalyze the reaction of isocyanate groups with hydroxyl groups to form polyurethanes, wherein from about 1%-100% of the polyol mixture employed in said foam reaction consists of a digestion product obtained by digesting polyalkylene terephthalate in a digesting polyol selected from the class consisting of diols and triols haivng a molecular weight of from about 60-500.

Claim 30

Dependent Claim 30 words

The foam of claim 25 wherein the digesting polyol used to prepare the digestion product polyol is selected from the group consisting of diethylene glycol, dipropylene glycol and hydroxy-terminated polyesters.

Claim 31

Dependent Claim 16 words

The foam of claim 25 wherein the digesting polyol comprises at least in part dipropylene glycol.

Claim 32

Dependent Claim 15 words

The foam of claim 24 wherein the --NCO/--OH index of the reactants is between 1.5-6

Claim 33

Dependent Claim 11 words

The foam of claim 24 further including at least one surfactant.

Claim 34

Dependent Claim 12 words

The foam of claim 24 further including at least one flame retardant.

Claim 35

Independent Claim 96 words

A method for making rigid polyisocyanurate foam which comprises combining: a. an organic polyisocyanate; b. a minor amount of a polyol mixture; c. a blowing agent; and d. a catalyst systen known to catalyze the trimerization of isocyanates to form isocyanurates, and to catalyze the reaction of isocyanate groups with hydroxyl groups to form polyurethanes, wherein from about 1% to 100% of said polyol mixture consists of the digestion product obtained by digesting polyalkylene terephthalate in a digesting polyol selected from the class consisting of diols and triols having a moleuclar weight of from about 60-500.

Claim 36

Independent Claim 96 words

A method for making rigid polyisocyanurate foam which comprises combining: a. an organic polyisocyanate; b. a minor amount of a polyol mixture; c. a blowing agent; and d. a catalyst systen known to catalyze the trimerization of isocyanates to form isocyanurates, and to catalyze the reaction of isocyanate groups with hydroxyl groups to form polyurethanes, wherein from about 1% to 100% of said polyol mixture consists of the digestion product obtained by digesting polyalkylene terephthalate in a digesting polyol selected from the class consisting of diols and triols having a moleuclar weight of from about 60-500.

Claim 37

Dependent Claim 30 words

The method of claim 30 wherein the digesting polyol used to prepare the digestion product polyol is selected from the group consisting of diethylene glycol, dipropylene glycol and hydroxy-terminated polyesters.

Claim 38

Dependent Claim 16 words

The method of claim 31 wherein the digesting polyol comprises at least in part dipropylene glycol.

Claim 39

Dependent Claim 15 words

The method of claim 30 wherein the --NCO/--0H index of the reactants is between 1.5-6.

Claim 40

Dependent Claim 11 words

The method of claim 30 further including at least one surfactant.

Claim 41

Dependent Claim 12 words

The method of claim 30 further including at least one flame retardant.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-12-07	1991-06-08	1991-12-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-12-07	1995-06-08	1995-12-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-12-07	1999-06-08	1999-12-08	$7700.00	Window Closed / Lapsed

Polyisocyanurate foams from digestion products of polyalkylene terephthalate polymers and polyols

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