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US4539157A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid diphenylmethane diisocyanate compositions

Assignee: Bayer Corp
•
Filing: 1984-12-14
•
Granted: 1985-09-03
•
Expires: 2004-12-14
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Abstract

Abstract The present invention is directed to a process for the preparation of a stable, liquid adduct comprising reacting a mixture of neopentyl glycol and propylene glycol with a diphenylmethane diisocyanate containing less than 85 percent by weight of the 4,4'-isomer at a temperature of from about 25° C. to about 120° C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight and wherein the ratio of mole equivalents of neopentyl glycol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that (i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is not less than 80 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30, (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percent by weight but not less than 70 percent by weight, then said ratio is from 0.35:0.65 to 0.85:0.15, and (iii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 70 percent by weight, but not less than 65 percent by weight, then said ratio is from 0.15:0.85 to 0.95:0.05. The present invention is also directed to a product produced from such process.

Inventors

  • 👤 John E. Dewhurst
  • 👤 Jeffrey F. Dormish
  • 👤 Richard S. Pantone

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 07:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8019

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 184 words
A process for the preparation of a stable, liquid adduct comprising reacting a mixture of neopentyl glycol and propylene glycol with a diphenylmethane diisocyanate containing less than 85 percent by weight of the 4,4'-isomer at a temperature of from about 25° C. to about 120° C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight and wherein the ratio of mole equivalents of neopentyl glycol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that (i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is not less than 80 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30, (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percent by weight but not less than 70 percent by weight, then said ratio is from 0.35:0.65 to 0.85:0.15, and (iii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 70 percent by weight, but not less than 65 percent by weight, then said ratio is from 0.15:0.85 to 0.95:0.05.
Claim 2
Dependent Claim 184 words
A process for the preparation of a stable, liquid adduct comprising reacting a mixture of neopentyl glycol and propylene glycol with a diphenylmethane diisocyanate containing less than 85 percent by weight of the 4,4'-isomer at a temperature of from about 25° C. to about 120° C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight and wherein the ratio of mole equivalents of neopentyl glycol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that (i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is not less than 80 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30, (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percent by weight but not less than 70 percent by weight, then said ratio is from 0.35:0.65 to 0.85:0.15, and (iii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 70 percent by weight, but not less than 65 percent by weight, then said ratio is from 0.15:0.85 to 0.95:0.05.
Claim 3
Dependent Claim 43 words
The process of claim 1 wherein said diphenylmethane diisocyanate contains from 30 to 84 percent by weight of the 4,4'-isomer, from 6 to about 70 percent by weight of the 2,4'-isomer, and from 0 to about 10 percent by weight of the 2,2'-isomer.
Claim 4
Dependent Claim 17 words
The process of claim 1, wherein said temperature is from about 40° C. to about 100° C.
Claim 5
Dependent Claim 17 words
The process of claim 3, wherein said temperature is from about 60° C. to about 80° C.
Claim 6
Dependent Claim 22 words
The process of claim 1, wherein said adduct has an isocyanate group content of from about 21 to 27 percent by weight.
Claim 7
Dependent Claim 20 words
The process of claim 1, wherein the equivalent ratio of isocyanate to hydroxyl groups is from about 3:1 to 13:1.
Claim 8
Dependent Claim 15 words
The process of claim 6, wherein said equivalent ratio is from about 3:1 to 7:1.
Claim 9
Dependent Claim 13 words
The process of claim 1 wherein said ratio is from 0.45:0.55 to 0.65:0.35.
Claim 10
Dependent Claim 8 words
The product of the process of claim 1.
Claim 11
Dependent Claim 8 words
The product of the process of claim 5.
Claim 12
Dependent Claim 8 words
The product of the process of claim 8.

References Cited (Backward Citations)

US3644457A Cited
US3883571A Cited
US4055548A Cited
US4118411A Cited
US4115429A Cited
US4229347A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-09-02 1989-03-04 1989-09-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-09-02 1993-03-04 1993-09-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-09-02 1997-03-04 1997-09-03 $7700.00 Window Closed / Lapsed

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