§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3897398A Expired / Lapsed US ⏱️ 0.0 years remaining

Fire resistant polymers produced by reacting phenyl isothiocyanate and tris (hydroxymethyl) phosphine

Assignee: United States Department of Agriculture
•
Filing: 1972-05-31
•
Granted: 1975-07-29
•
Expires: 1992-05-31
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Methylol phosphines, methylol phosphines in combination with amine or amido compounds or water soluble adducts of these methylol phosphines and amides or amines when mixed and reacted with mono, di or polyisocyanates wherein the isocyanate groups are attached to carbon atoms are particularly valuable for the preparation of thermosetting flame resistant polymers. The polymers which are produced are crosslinked phosphorus and nitrogen containing polymers in which the reoccurring structure units each contain a phosphorus atom, that is a component of the radical tris(methylene)-phosphine (-CH2)3P and is linked to at least one isocyanate radical by connecting urethane structure. The polymer forming solutions are also valuable for the preparation of flame-, glow-, wrinkle- and shrink-resistant textiles, said textiles being produced by impregnating fabrics with these solutions and causing reaction and polymer formation by application of heat.

Inventors

  • 👤 John V Beninate
  • 👤 Donald J Daigle
  • 👤 Jr George L Drake
  • 👤 Wilson A Reeves
  • 👤 Darrell J Donaldson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 06:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/3889; C08G18/388; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D06M15/579; D06M15/667; D06M15/673; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 67 words
THE POLYMERS PRODUCED BY MIXING PHENYL ISOCYANATE AND TRIS(HYDROXYMETHYL)PHOSPHINE IN SOLUTION WITH DIMETHYLFORMAMIDE IN MOLE RATIOS OF ABOUT FROM 1:3 TO ABOUT 3:1 AND POLYMERIZING AT TEMPERATURES ABOUT FROM 28* TO ABOUT 155*C FOR PERIODS RANGING ABOUT FROM 24 HOURS TO ABOUT 3 MINUTES, THE LONGER PERIODS OF TIME BEING USED IN CONJUCTION WITH THE LOWER TEMPERATURES AND THE SHORTER PERIODS OF TIME WITH THE HIGHER TEMPERATURES.
Claim 2
Dependent Claim 67 words
THE POLYMERS PRODUCED BY MIXING PHENYL ISOCYANATE AND TRIS(HYDROXYMETHYL)PHOSPHINE IN SOLUTION WITH DIMETHYLFORMAMIDE IN MOLE RATIOS OF ABOUT FROM 1:3 TO ABOUT 3:1 AND POLYMERIZING AT TEMPERATURES ABOUT FROM 28* TO ABOUT 155*C FOR PERIODS RANGING ABOUT FROM 24 HOURS TO ABOUT 3 MINUTES, THE LONGER PERIODS OF TIME BEING USED IN CONJUCTION WITH THE LOWER TEMPERATURES AND THE SHORTER PERIODS OF TIME WITH THE HIGHER TEMPERATURES.

References Cited (Backward Citations)

CA743644A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-07-28 1979-01-27 1979-07-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-07-28 1983-01-27 1983-07-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-07-28 1987-01-27 1987-07-29 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag