Process of spraying a polyether-based polyurethane foam

• US 3,091,551 A
• Filed: 11/25/1960
• Issued: 05/28/1963
• Est. Priority Date: 01/26/1959
• Status: Expired due to Term

• Current Assignee: Earl J. Robertson
• Original Assignee: Earl J. Robertson
• Inventors: Robertson, Earl J.
• Application Number:
  US04/071,826
• Time in Patent Office: 914 Days
• US Class Current: 427/426
• CPC Class Codes: B29B 7/7409 with supply of gas
• CPC Class Codes: B29B 7/7419 with static or injector mixer elements
• CPC Class Codes: B29B 7/7447 including means for feeding the components
• CPC Class Codes: B29B 7/7452 for mixing components by spraying them into each other; for mixing by intersecting sheets
• CPC Class Codes: C08G 18/0895 Manufacture of polymers by continuous processes C08G18/0838 takes precedence
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/2063 having two nitrogen atoms in the condensed ring system
• CPC Class Codes: C08G 18/244 tin salts of carboxylic acids
• CPC Class Codes: C08G 18/3284 containing four hydroxy groups
• CPC Class Codes: C08G 18/6688 with compounds of group C08G18/3271
• CPC Class Codes: C08G 2110/0025 rigid
• CPC Class Codes: C08G 2110/0041 having specified density
• CPC Class Codes: C08G 2150/60 Compositions for foaming; Foamed or intumescent coatings
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 9/14 organic
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/249965 Cellulosic
• CPC Class Codes: Y10T 428/249968 Of hydraulic-setting material
• CPC Class Codes: Y10T 428/24999 Inorganic

Claims

1. A METHOD OF COATING A SOLID SURFACE WITH A STABLE RIGID POLYETHER-BASED SOLVENT-BLOWN POLYURETHANE FOAM WHICH COMPRISES SPRAYING:

(A) A POLYOXYALKYLENE ADDITION PRODUCT OF A POLYHYDRIC ALCOHOL HAVING FROM 2-6 HYDROXYL GROUPS INCLUSIVE, HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 270 AND 1200 AND AN EQUIVALENT WEIGHT BETWEEN ABOUT 90 AND 300;

(B) A TETRA (HYDROXYALKYL) ALKYLENE DIAMINE HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 220 AND 400 AND AN EQUIVALENT WEIGHT BETWEEN ABOUT 55 AND 100;

(C) AN ORGANIC POLYISOCYANATE;

(D) A WETTING AGENT;

(E) A BLOWING SOLVENT;

AND (F) A CATALYST SELECTED FROM THE GROUP CONSISTING OF TRIETHYLENE DIAMINE, DIBUTYLTIN DIACETATE, DIBUTYLTIN DILAURATE, DIBUTYLTIN DI-2-ETHYLHEXOATE, STANNOUS OCTOATE, STANNOUS OLEATE, AND MIXTURES OF THE FOREGOING;

AND IMPINGING THE SPRAY, SAID SPRAY CONTAINING A MAXIMUM OF 0.5% BY WEIGHT OF ADDED WATER, AS AN INTIMATE MIXTURE UPON A COMMON SOLID SURFACE WHEREBY SUBSTANTIALLY IMMEDIATE FOAMING AND ADHERENCE OF FOAM IS EFFECTED ON SAID COMMON SURFACE, THE FOLLOWING FURTHER CONDITIONS BEING MAINTAINED;

(G) THE OVER-ALL NCO/OH EQUIVALENT RATIO BEING BETWEEN ABOUT 0.8/1 AND 1.2/1;

(H) THE RATIO OF RESPECTIVE EQUIVALENTS OF SAID TETRA(HYDROXYALKYL)ALKYLENE DIAMINE TO SAID POLYOXYALKYLENE ADDITION PRODUCT OF A POLYHYDRIC ALCOHOL BEING BETWEEN ABOUT 0.75/1 AND 6/1;

(I) THE AVERAGE EQUIVALENT WEIGHT OF SAID POLYOXYALKYLENE ADDITION PRODUCT OF A POLYHYDRIC ALCOHOL AND SAID TETRA(HYDROXYALKYL)ALKYLENE DIAMINE COMBINED BEING BETWEEN ABOUT 80 AND 130;

AND (J) THE SEPARATION OF SAID TETRA(HYDROXYALKYL)ALKYLENE DIAMINE AND SAID ORGANIC POLYISOCYANATE UNTIL COMMENCEMENT OF SPRAYING.