Dimensionally stable closed cell rigid polyisocyanate based foam

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

5211091, 521115, 521128, 521174, C08G 1812, C08G 1818

Patent

active

054552834

ABSTRACT:
There is now provided a closed cell rigid polyisocyanate based foam blowing with a C.sub.1 -C.sub.4 hydrofluorocarbon and water as blowing agents, which possesses a uniform density gradient varying by not more than 10 percent. There is also now provided a froth foaming mixture having good flow by employing a hydroxy terminated polyol which is pH neutral and a tertiary amine ether blow catalyst in an amount of 0.5 weight percent or more, using water and a C.sub.1 -C.sub.4 hydrofluorocarbon having a boiling point of 300.degree. K. or less as co-blowing agents.
There is also provided a polyol composition having an average OH number of less than 400 and an average functionality of greater than 4, which when reacted with the isocyanate in the presence of a C.sub.1 -C.sub.4 hydrofluorocarbon, yields a rigid closed cell polyisocyanate based dimensionally stable foam.
The formulation according to an especially preferred embodiment of the invention simultaneously satisfies the following requirements:
1) a formulated polyol composition having a viscosity of 550 cP or less;
2) the isocyanate stream and the formulated polyol stream dispensable at a 0.9:1 to 1.3:1 weight ratio, respectively;
3) frothing when dispensed from a static mixer;
4) produces a frothing foaming mixture having excellent flow characteristics as demonstrated by a substantially uniform density gradient;
5) and produces a dimensionally stable dosed cell foam having a low overall density of 2.5 pcf or less.

REFERENCES:
patent: 3541023 (1970-11-01), Cole
patent: 3769232 (1973-10-01), Houldridge
patent: 4331778 (1982-05-01), Sommerfeld et al.
patent: 4927863 (1990-05-01), Bartlett et al.
patent: 4945119 (1990-07-01), Smits et al.
patent: 4997706 (1991-03-01), Smits et al.
patent: 5100922 (1992-03-01), Wada et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Dimensionally stable closed cell rigid polyisocyanate based foam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dimensionally stable closed cell rigid polyisocyanate based foam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dimensionally stable closed cell rigid polyisocyanate based foam will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1077895

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.