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US5096933A
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Process for the preparation of polyurethane rigid foams having a low thermal conductivity and their use
Assignee: BASF SE
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Filing: 1990-09-04
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Granted: 1992-03-17
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Expires: 2010-09-04
Abstract
Abstract The present invention relates to a process for the preparation of polyurethane rigid foams having a low thermal conductivity, comprising reacting: a) organic and/or modified organic polyisocyanates with, b) at least one higher molecular weight compound having at least two reactive hydrogen atoms, and optionally c) lower molecular weight chain extending agents and/or crosslinking agents in the presence of, d) cyclopentane (d1) or mixtures (d2) comprising, d2i) cyclopentane, and/or cyclohexane, d2ii) at least one compound homogeneously miscible with cyclopentane and/or cyclohexane, said compound preferably has a boiling point below 35 DEG C. and is selected from the group consisting of alkanes, cycloalkanes having a maximum of 4 carbon atoms, dialkylethers, cycloalkylene ethers and fluoroalkanes, optionally combined with water as said blowing agent (d), e) catalysts, and optionally f) auxiliaries and/or additives. Polyurethane rigid foams are used in the low temperature appliance industry and as insulating materials in heating and composite elements.
Inventors
- 👤 Otto Volkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:00
CPC Classifications
C; C08; C08G; C08G18/00; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4883; C08J9/149; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2170/00; C08G2170/60; C08J2203/00; C08J2203/12; C08J2203/14; C08J2203/18; C08J2203/182; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
104 words
A process for the preparation of polyurethane rigid foams having a low thermal conductivity, comprising reacting: a) organic and/or modified organic polyisocyanates with: b) at least one higher molecular weight compound having at least two reactive hydrogen atoms, and optionally; c) lower molecular weight, chain extending agents, and/or crosslinking agents; in the presence of: d) blowing agents; e) catalysts and optionally; f) auxiliaries and/or additives; wherein; d1) cyclopentane; or, d2) mixtures comprising: d2i) cyclopentane, cyclohexane, or a mixture of these cycloalkanes; and, d2ii) low boiling point compounds, homogeneously miscible with cyclopentane and/or cyclohexane are used in conjunction with water as said blowing agent (d).
Claim 2
Dependent Claim
104 words
A process for the preparation of polyurethane rigid foams having a low thermal conductivity, comprising reacting: a) organic and/or modified organic polyisocyanates with: b) at least one higher molecular weight compound having at least two reactive hydrogen atoms, and optionally; c) lower molecular weight, chain extending agents, and/or crosslinking agents; in the presence of: d) blowing agents; e) catalysts and optionally; f) auxiliaries and/or additives; wherein; d1) cyclopentane; or, d2) mixtures comprising: d2i) cyclopentane, cyclohexane, or a mixture of these cycloalkanes; and, d2ii) low boiling point compounds, homogeneously miscible with cyclopentane and/or cyclohexane are used in conjunction with water as said blowing agent (d).
Claim 3
Dependent Claim
65 words
The process of claim 1 wherein said mixture d2) comprises: d2i) cyclopentane, cyclohexane, or a mixture of cycloalkanes; and, d2ii) compounds having a boiling point less than 35° C., homogeneously miscible with cyclopentane and/or cyclohexane, selected from the group consisting of; alkanes, cycloalkanes having a maximum of 4 carbon atoms, dialkyl ethers, cycloalkylene ethers, fluoroalkanes, and mixtures of at least two of the aforesaid compounds.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein said cyclopentane (d1) or said blowing agent mixture (d2) is used in conjunction with water.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said blowing (d2) has a boiling point less than 30° C.
Claim 6
Dependent Claim
19 words
The process of claim 2 wherein said blowing agent mixture (d2) has a boiling point less than 30° C.
Claim 7
Dependent Claim
57 words
The process of claim 1 wherein: d1) cyclopentane; or, d2) a mixture comprising: d2i) cyclopentane, cyclohexane, or a mixture of these cycloalkanes; d2ii)at least one compound selected from the group consisting of n-butane, isobutane, cyclobutane, dimethyl ether, diethyl ether, furan, trifluoromethane, difluoromethane, difluoroethane, tetrafluoroethane, and heptafluoropropane; are used as said blowing agent (d) in conjunction with water.
Claim 8
Dependent Claim
42 words
The process of claim 1 wherein; d1) 3 to 22 parts by weight of cyclopentane combined with from 0 to 7 parts by weight of water, is used as said blowing agent (d) per 100 parts by weight of starting component (b).
Claim 9
Dependent Claim
90 words
The process of claim 1 wherein; d2i) 2 to 22 parts by weight of cyclopentane and/or cyclohexane; d2ii) 0.1 to 18 parts by weight of at least one compound having a boiling point less than 35° C. homogeneously miscible with cyclopentane and/or cyclohexane, selected from the group consisting of alkanes, cycloalkanes having a maximum of 4 carbon atoms, dialkyl ethers cycloalkylene ethers, and fluoroalkanes combined with from 0 to 7 parts by weight of water; are used as said blowing agent (d) per 100 parts by weight of starting component.
Claim 10
Dependent Claim
34 words
The process of claim 1 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 11
Dependent Claim
34 words
The process of claim 2 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 12
Dependent Claim
34 words
The process of claim 1 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 13
Dependent Claim
34 words
The process of claim 3 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 14
Dependent Claim
34 words
The process of claim 4 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 15
Dependent Claim
34 words
The process of claim 5 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 16
Dependent Claim
34 words
The process of claim 6 wherein a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate having a diphenylmethane diisocyanate isomeric content of from 30 to 80 weight percent are used said organic polyisocyanate (a).
Claim 17
Dependent Claim
37 words
The process of claim 1 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 18
Dependent Claim
37 words
The process of claim 2 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 19
Dependent Claim
37 words
The process of claim 1 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 20
Dependent Claim
37 words
The process of claim 3 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 21
Dependent Claim
37 words
The process of claim 4 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 22
Dependent Claim
37 words
The process of claim 5 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 23
Dependent Claim
37 words
The process of claim 6 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 24
Dependent Claim
37 words
The process of claim 7 wherein at least one polyhydroxyl compound having a functionality of from 2 to 8 and a hydroxyl number of from 150 to 850 is used as said higher molecular weight compounds (b).
Claim 25
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 1.
Claim 26
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 2.
Claim 27
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 3.
Claim 28
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 4.
Claim 29
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 5.
Claim 30
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 6.
Claim 31
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 7.
Claim 32
Dependent Claim
12 words
The polyurethane rigid foams prepared according to the process of claim 8.
Claim 33
Dependent Claim
146 words
A process for the preparation of polyurethane rigid foams having a thermal conductivity of 0.02 to 0.024 W/M·°K. consisting essentially of reacting: a) organic and/or modified organic polyisocyanates with: b) lower molecular weight compound having at least two reactive hydrogen atoms, and optionally; c) lower molecular weight, chain extending agents, and/or crosslinking agents; in the presence of: d) blowing agents; e) catalysts and optionally f) fillers, flame retardants, dyes, pigments, hydrolysis preventing agents, cell regulators, and/or foam stabilizers selected from the group consisting of organopolysiloxanes, siloxaneoxyalkylene mixed polymers, oxyethylated alkylphenols, oxyethylated fatty alcohols, paraffin oils, castor oil, ricinoleic acid esters, Turkey red oil, and peanut oil; wherein; d1) cyclopentane; or, d2) mixtures comprising: d2i) cyclopentane, cyclohexane, or a mixture of these cycloalkanes; and d2ii) compounds having a boiling point less than 35° C., homogeneously miscible with cyclopentane and/or cyclohexane are used as said blowing agent (d).
Claim 34
Dependent Claim
146 words
A process for the preparation of polyurethane rigid foams having a thermal conductivity of 0.02 to 0.024 W/M·°K. consisting essentially of reacting: a) organic and/or modified organic polyisocyanates with: b) lower molecular weight compound having at least two reactive hydrogen atoms, and optionally; c) lower molecular weight, chain extending agents, and/or crosslinking agents; in the presence of: d) blowing agents; e) catalysts and optionally f) fillers, flame retardants, dyes, pigments, hydrolysis preventing agents, cell regulators, and/or foam stabilizers selected from the group consisting of organopolysiloxanes, siloxaneoxyalkylene mixed polymers, oxyethylated alkylphenols, oxyethylated fatty alcohols, paraffin oils, castor oil, ricinoleic acid esters, Turkey red oil, and peanut oil; wherein; d1) cyclopentane; or, d2) mixtures comprising: d2i) cyclopentane, cyclohexane, or a mixture of these cycloalkanes; and d2ii) compounds having a boiling point less than 35° C., homogeneously miscible with cyclopentane and/or cyclohexane are used as said blowing agent (d).
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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) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |