US4256846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing flameproof polyisocyanurate foams
Assignee: Bridgestone Corp
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Filing: 1979-07-20
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Granted: 1981-03-17
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Expires: 1999-07-20
Abstract
Abstract A method of producing flameproof polyisocyanurate foams is disclosed. When the foam is produced by reacting an organic polyisocyanate with polyols as a modifying agent in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives, a combination of particular low molecular weight diols with particular high molecular weight polyether polyols is used as the polyol in a special weight ratio and a special total amount per 100 parts by weight of the organic polyisocyanate in the presence of special combination of an alkali metal salt of a carboxylic acid and a tertiary amine compound as the catalyst.
Inventors
- 👤 Takashi Ohashi
- 👤 Toru Okuyama
- 👤 Hiroshi Kaneda
- 👤 Yoshiko Taniguchi
- 👤 Masako Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/09; C08G18/092; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/67; C08G18/675; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
265 words
A method of producing flameproof polyisocyanurate foams by reacting an organic polyisocyanate with a polyol in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives to form an urethane modified polyisocyanurate foam, which comprises: (1) using, as said polyol, at least one low molecular weight diol selected from the group consisting of (a) compounds having the general formula HO--(CH.sub.2 CH.sub.2 O).sub.n H, wherein n is 2, 3 or 4, (b) compounds having the general formula ##STR5## wherein n is 2 or 3, (c) 2,3,-butane diol and (d) 2-butene-1,4-diol together with at least one high molecular weight polyether polyol having 2 to 4 hydroxyl groups in its molecule and a hydroxyl equivalent of 600 to 2,000, (2) being a weight ratio of the sum of low molecular weight diols to the sum of high molecular weight polyetherpolyols within a range of 0.55 to 7.0, (3) being a total amount of the low molecular weight diols and high molecular weight polyetherpolyols used as said polyol within a range of 12.5 to 25 parts by weight per 100 parts by weight of said organic polyisocyanate, and (4) using, as said isocyanate trimerization catalyst, a combination of an alkali metal salt of a carboxylic acid having a carbon number of 2 to 12 with a tertiary amino compound in case of using said low molecular-weight (a)-type diol, or a combination of an alkali metal salt of a carboxylic acid having a carbon number of 2 to 12 with a dialkylaminoalkyl phenol in case of using said low molecular weight (b), (c) or (d)-type diol alone.
Claim 2
Independent Claim
265 words
A method of producing flameproof polyisocyanurate foams by reacting an organic polyisocyanate with a polyol in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives to form an urethane modified polyisocyanurate foam, which comprises: (1) using, as said polyol, at least one low molecular weight diol selected from the group consisting of (a) compounds having the general formula HO--(CH.sub.2 CH.sub.2 O).sub.n H, wherein n is 2, 3 or 4, (b) compounds having the general formula ##STR5## wherein n is 2 or 3, (c) 2,3,-butane diol and (d) 2-butene-1,4-diol together with at least one high molecular weight polyether polyol having 2 to 4 hydroxyl groups in its molecule and a hydroxyl equivalent of 600 to 2,000, (2) being a weight ratio of the sum of low molecular weight diols to the sum of high molecular weight polyetherpolyols within a range of 0.55 to 7.0, (3) being a total amount of the low molecular weight diols and high molecular weight polyetherpolyols used as said polyol within a range of 12.5 to 25 parts by weight per 100 parts by weight of said organic polyisocyanate, and (4) using, as said isocyanate trimerization catalyst, a combination of an alkali metal salt of a carboxylic acid having a carbon number of 2 to 12 with a tertiary amino compound in case of using said low molecular-weight (a)-type diol, or a combination of an alkali metal salt of a carboxylic acid having a carbon number of 2 to 12 with a dialkylaminoalkyl phenol in case of using said low molecular weight (b), (c) or (d)-type diol alone.
Claim 3
Dependent Claim
15 words
The method as claimed in claim 1, wherein said organic polyisocyanate is an aromatic polyisocyanate.
Claim 4
Dependent Claim
35 words
The method as claimed in claim 1, wherein said organic polyisocyanate is a polynuclear polyisocyanate having the following formula ##STR6## wherein n is 0 or an integer of more than 1, or a mixture thereof.
Claim 5
Dependent Claim
90 words
The method as claimed in claim 1, wherein said high molecular weight polyetherpolyol is selected from polyoxyalkylene glycols obtained by reacting ethylene oxide, propylene oxide, butylene oxide or a mixture thereof with a diol such as ethylene glycol, 1,2-propylene glycol, 1,3-propane diol, 1,4-butane diol, 2,3-butane diol, 1,5-pentane diol, 1,2-hexane diol, diethylene glycol and dipropylene glycol; polyoxyalkylene triols or polyoxyalkylene tetraols obtained by reacting ethylene oxide, propylene oxide, butylene oxide or a mixture thereof with a triol or tetraol such as glycerin, trimethylol propane, 1,2,6-hexane triol and pentaerythritol; and polytetramethylene glycol.
Claim 6
Dependent Claim
31 words
The method as claimed in claim 1, wherein said weight ratio of the sum of low molecular weight diols to the sum of high molecular weight polyetherpolyols is 1.0 to 5.0.
Claim 7
Dependent Claim
38 words
The method as claimed in claim 1, wherein said total amount of low molecular weight diols and high molecular weight polyetherpolyols used is 14 to 22 parts by weight per 100 parts by weight of said organic polyisocyanate.
Claim 8
Dependent Claim
41 words
The method as claimed in claim 1, wherein said alkali metal salt of carboxylic acid having a carbon number of 2 to 12 is selected from the group consisting of potassium acetate, potassium propionate, potassium 2-ethylhexanoate, potassium caprylate and mixtures thereof.
Claim 9
Dependent Claim
33 words
The method as claimed in claim 1, wherein said tertiary amino compound is selected from dialkylaminoalkyl phenols; triethylamine; triazine cyclic derivatives; tetraalkylalkylene diamines; triethylenediamine and its lower alkyl substituted derivatives; and mixtures thereof.
Claim 10
Dependent Claim
21 words
The method as claimed in claim 1, wherein said dialkylaminoalkyl phenol is selected from 2,4,6-tris(dimethylaminoethyl)phenol, 2,4- and 2,6-bis(dimethylaminomethyl)phenols and mixtures thereof.
Claim 11
Dependent Claim
19 words
The method as claimed in claim 1, wherein said blowing agent is a fluorinated and/or chlorinated low-boiling inert solvent.
Claim 12
Dependent Claim
13 words
The method as claimed in claim 1, wherein said blowing agent is trichloromonofluoromethane.
Claim 13
Dependent Claim
12 words
The method of claim 8 wherein said triazine cyclic derivative is N,N',N"-tris(dimethylaminopropyl)-sym-hexahydrotriazine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |