Patent US3633561A successfully refreshed from Google Patents.
Patent US4758607A successfully refreshed from Google Patents.
US4758607A
Expired / Lapsed
US
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Distilled products of polyethylene terephthalate polymers and polycarboxylic acid-containing polyols and polymeric foams obtained therefrom
Assignee: SLOSS INDUSTRIES Corp A CORP OF
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Filing: 1985-07-18
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Granted: 1988-07-19
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Expires: 2005-07-18
Abstract
Abstract A storage stable polyester polyol mixture is prepared by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.
Inventors
- 👤 Richard K. Hallmark
- 👤 Ernest K. Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08G2110/00; C08G2110/0025; C08G2115/00; C08G2115/02; C08G2170/00; C08G2170/60; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
71 words
A process for preparing a polyester polyol mixture comprising (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture.
Claim 2
Dependent Claim
71 words
A process for preparing a polyester polyol mixture comprising (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture.
Claim 3
Dependent Claim
55 words
The process of claim 1 wherein said polycarboxylic acid component-containing polyol includes at least one glycol which is co-distillable with said liberated ethylene glycol, and said distillation step (b) is conducted to distill from said digested polyol mixture the amount of liberated ethylene glycol and codistillable glycol sufficient for improved storage stability of the mixture.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein said distillation step (b) is conducted rapidly at reduced temperature and pressure to prevent or minimize the liberation of further ethylene glycol from said polyethylene terephthalate during the distillation.
Claim 5
Dependent Claim
75 words
The process of claim 3 wherein said digesting polycarboxylic acid component is a member selected from the group consisting of phthalic anhydride, phthalic acid, isophthalic acid, trimellitic anhydride, trimellitic acid, benzophenonetetracarboxylic dianhydride, esters of said polycarboxylic acid components and mixtures thereof, and said digesting polyol component is a member selected from the group consisting of diethylene glycol, dipropylene glycol, mixtures of said glycols and mixtures of said glycols with at least one other oxyalkylene glycol.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein the glycols distilled in said step (b) are recycled to said step (a).
Claim 7
Dependent Claim
72 words
A polyester polyol mixture comprising the reaction product obtained by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture.
Claim 8
Dependent Claim
72 words
A polyester polyol mixture comprising the reaction product obtained by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture.
Claim 9
Dependent Claim
57 words
The polyester polyol mixture of claim 6 wherein said polycarboxylic acid component-containing polyol includes at least one glycol which is co-distillable with said liberated ethylene glycol, and said distillation step (b) is conducted to distill from said digested polyol mixture the amount of liberated ethylene glycol and co-distillable glycol sufficient for improved storage stability of the mixture.
Claim 10
Dependent Claim
37 words
The polyester polyol mixture of claim 7 wherein said distillation step (b) is conducted rapidly at reduced temperature and pressure to prevent or minimize the liberation of further ethylene glycol from said polyethylene terephthalate during the distillation.
Claim 11
Dependent Claim
27 words
The polyester polyol mixture of claim 8 wherein said digesting polycarboxylic acid component has aromatic ring units with two ##STR10## groups on adjacent or alternate ring positions.
Claim 12
Dependent Claim
41 words
The polyester polyol mixture of claim 9 wherein said digesting polyol component is a member selected from the group consisting of diethylene glycol, dipropylene glycol, mixtures of said glycols and mixtures of said glycols with at least one other oxyalkylene glycol.
Claim 13
Dependent Claim
43 words
The polyester polyol mixture of claim 10 wherein said digesting polycarboxylic acid component is a member selected from the group consisting of phthalic anhydride, phthalic acid, isophthalic acid, trimellitic anhydride, trimellitic acid, benzophenonetetracarboxylic dianhydride, esters of said polycarboxylic acid components and mixtures thereof.
Claim 14
Dependent Claim
39 words
The polyester polyol mixture of claim 11 wherein said digesting polycarboxylic acid component is a member selected from the group consisting of phthalic anhydride, esters of phthalic anhydride and mixtures thereof, and said digesting polyol component is diethylene glycol.
Claim 15
Dependent Claim
43 words
The process of claim 3 wherein substantially all of the ethylene glycol formed in the digestion is distilled from said digested polyol mixture, and additional polyol is optionally added after said distillation step (b) to yield the desired equivalent weight of the mixture.
Claim 16
Dependent Claim
75 words
The process of claim 13 wherein said digestin polycarboxylic acid component is a member selected from the group consisting of phthalic anhydride, phthalic acid, isophthalic acid, trimellitic anhydride, trimellitic acid, benzophenonetetracarboxylic dianhydride, esters of said polycarboxylic acid components and mixtures thereof, and said digesting polyol component is a member selected from the group consisting of diethylene glycol, dipropylene glycol, mixtures of said glycols and mixtures of said glycols with at least one other oxyalkylene glycol.
Claim 17
Dependent Claim
23 words
The process of claim 14 wherein said digesting polycarboxylic acid component is pre-reacted with said digesting polyol component before said digestion step (a).
Claim 18
Dependent Claim
72 words
The polyester polyol mixture of claim 8 wherein in the digestion reaction the ratio of equivalents of total polyol to equivalents of total acid is 1.5-10 to 1, the ratio of moles of said polyethylene tere phthalate to moles of said digesting polycarboxylic acid component is 1.0-10 to 1, and the ratio of moles of said digesting polyol component to moles of ethylene glycol in said polyethylene terephthalate is 1.8-2.5 to 1.
Claim 19
Dependent Claim
42 words
The polyester polyol mixture of claim 16 wherein said polyester polyol mixture has a viscosity in cps at 25° C. of about 700 to 12,000, a hydroxyl number of about 300 to 475, and an acid member of about 0.2 to 10.
Claim 20
Dependent Claim
45 words
The polyester polyol mixture of claim 8 wherein substantially all of the ethylene glycol formed in the digestion is distilled from said digested polyol mixture, and additional polyol is optionally added after said distillation step (b) to yield the desired equivalent weight of the mixture.
Claim 21
Dependent Claim
77 words
The polyester polyol mixture of claim 18 wherein said digesting polycarboxylic acid component is a member selected from the group consisting of phthalic anhydride, phthalic acid, isophthalic acid, trimellitic anhydride, trimellitic acid, benzophenonetetracarboxylic dianhydride, ester of said polycarboxylic acid components and mixture thereof, and said digesting polyol component is a member selected from the group consisting of diethylene glycol, dipropylene glycol, mixtures of said glycols and mixtures of said glycols with at least one other oxyalkylene glycol.
Claim 22
Dependent Claim
25 words
The polyester polyol mixture of claim 19 wherein said digesting polycarboxylic acid component is pre-reacted with said digesting polyol component before said digestion step (a).
Claim 23
Dependent Claim
71 words
The polester polyol mixture of claim 20 wherein in the digestion reaction the ratio of equivalents of total polyol to equivalents of total acid is 1.5-10 to 1, the ratio of moles of said polyethylene terephthalate to moles of said digesting polycarboxylic acid component to 1.0-10 to 1, and the ratio of moles of said digesting polyol component to moles of ethylene glycol in said polyethylene terephthalate is 1.8-2.5 to 1.
Claim 24
Dependent Claim
42 words
The polyester polyol mixture of claim 21 wherein said polyester polyol mixture has a viscosity in cps at 25° C. of about 700 to 12,000, a hydroxyl number of about 300 to 475, and an acid number of about 0.2 to 10.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |