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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 09:05
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
US4118411A Cited
US4162357A Cited

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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