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US4294934A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the production of elastic, optionally cellular, polyurethane ureas

Assignee: Bayer AG
•
Filing: 1980-06-30
•
Granted: 1981-10-13
•
Expires: 2000-06-30
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Abstract

Abstract The instant invention is directed to a process for the production of polyurethane urea elastomers having a gross density of more than 200 kg/m 3 comprising: casting a reaction mixture of (A) an isocyanate prepolymer produced from (a) 1 mole of a compound containing at least 2 Zerewitinoff-active hydrogen atoms and having a molecular weight of from 400 to 10,000 and (b) 2 to 10 moles of diisocyanatodiphenylmethane, (B) an aromatic diamine, and (C) 0 to 50 mole percent, based on component (B), of a polyol containing primary hydroxyl groups and having a molecular weight of from 62 to 6000, the equivalent ratio between component (A) and components (B) + (C) amounting to between 0.9:1 and 1.3:1, into a mold, hardening the reaction mixture in the mold and subsequently removing it from the mold, the improvement wherein said isocyanate prepolymer (A) has been produced using an isomer mixture comprising: from 15 to 80 mole percent of 2,4'-diisocyanatodiphenylmethane, from 20 to 85 mole percent of 4,4'-diisocyanatodiphenylmethane, and from 0 to 20 mole percent of 2,2'-diisocyanatodiphenylmethane.

Inventors

  • 👤 Gerhard Grogler
  • 👤 Jurgen Schwindt
  • 👤 Otto Ganster
  • 👤 Hans-Joachim Meiners
  • 👤 Hans-Dieter Ruprecht

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08G18/08; C08G18/10; C08G2110/00; C08G2110/0008; C08G2350/00; C08G2380/00; C08G2410/00; Y; Y10; Y10S; Y10S528/00; Y10S528/906

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 162 words
In a process for the production of polyurethane urea elastomers having a gross density of more than 200 kg/m 3 comprising: casting a reaction mixture of (A) an isocyanate prepolymer produced from (a) 1 mole of a compound containing at least 2 Zerewitinoff-active hydrogen atoms and having a molecular weight of from 400 to 10,000 and (b) 2 to 10 moles of diisocyanatodiphenylmethane, (B) an aromatic diamine, and (C) 0 to 50 mole percent, based on component (B), of a polyol having a molecular weight of from 62 to 6000, the equvalent ratio between component (A) and components (B)+(C) amounting to between 0.9:1 and 1.3:1, into a mold, hardening the reaction mixture in the mold and subsequently removing it from the mold, the improvement wherein said isocyanate prepolymer (A) has been produced using an isomer mixture comprising: from 15 to 80 mole percent of 2,4'-diisocyanatodiphenylmethane, from 20 to 85 mole percent of 4,4'-diisocyanatodiphenylmethane, and from 0 to 20 mole percent of 2,2'-diisocyanatodiphenylmethane.
Claim 2
Dependent Claim 162 words
In a process for the production of polyurethane urea elastomers having a gross density of more than 200 kg/m 3 comprising: casting a reaction mixture of (A) an isocyanate prepolymer produced from (a) 1 mole of a compound containing at least 2 Zerewitinoff-active hydrogen atoms and having a molecular weight of from 400 to 10,000 and (b) 2 to 10 moles of diisocyanatodiphenylmethane, (B) an aromatic diamine, and (C) 0 to 50 mole percent, based on component (B), of a polyol having a molecular weight of from 62 to 6000, the equvalent ratio between component (A) and components (B)+(C) amounting to between 0.9:1 and 1.3:1, into a mold, hardening the reaction mixture in the mold and subsequently removing it from the mold, the improvement wherein said isocyanate prepolymer (A) has been produced using an isomer mixture comprising: from 15 to 80 mole percent of 2,4'-diisocyanatodiphenylmethane, from 20 to 85 mole percent of 4,4'-diisocyanatodiphenylmethane, and from 0 to 20 mole percent of 2,2'-diisocyanatodiphenylmethane.
Claim 3
Dependent Claim 19 words
The process of claim 1, wherein said reaction mixture further comprises: (D) blowing agents, activator fillers and/or other additives.
Claim 4
Dependent Claim 43 words
The process of claim 1, wherein said isocyanate prepolymer (A) has been produced using an isomer mixture comprising: from 35 to 70 mole percent of 2,4'-diisocyanatodiphenylmethane, from 30 to 65 mole percent of 4,4'-diisocyanatodiphenylmethane, and from 0 to 15 mole percent of 2,2'-diisocyanatodiphenylmethane.
Claim 5
Dependent Claim 28 words
The process of claim 1, wherein a molar ratio between components (a) and (b) of from 1:2.5 to 1:5 is maintained during production of said isocyanate prepolymer (A).

References Cited (Backward Citations)

US3188302A Cited
US4071558A Cited
US3736350A Cited
US4137200A Cited
US4039581A Cited
US4163095A Cited
US4036820A Cited
US4125545A Cited
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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) 1984-10-12 1985-04-13 1985-10-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-10-12 1989-04-13 1989-10-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-10-12 1993-04-13 1993-10-13 $7700.00 Window Closed / Lapsed

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