Two-component polyurethane or polyisocyanurate low pressure spray foam composition containing a gaseous blowing agent comprising pressurized carbon dioxide

A two-component polyurethane or polyisocyanurate spray foam composition comprising:

• a) an A-side component comprising:
• i) one or more polyisocyanate,
• ii) one or more blowing agent;
• and
• iii) optionally, one or more surfactant;
• and
• b) a B-side component comprising:
• i) one or more polyol,
• ii) one or more blowing catalyst or gelation catalyst or combination thereof,
• iii) one or more blowing agent comprising pressurized gaseous carbon dioxide and one or more liquid blowing agent,
• iv) optionally, one or more flame retardant;
• and
• v) optionally, one or more surfactant;
• wherein the A-side component is contained in an A-side component container and the B-side component is contained in a B-side component container.

A method of providing a space filling layer or space filling volume adjacent to or on a surface, the method comprising:

• (a) providing a foamable composition comprising:
• (i) an A-side component comprising one or more polyisocyanate and one or more blowing agent;
• and
• (ii) a B-side component comprising one or more polyol and one or more blowing agent comprising pressurized gaseous carbon dioxide and one or more liquid blowing agent;
• wherein the A-side component is contained in an A-side component container and the B-side component is contained in a B-side component container;
• wherein both the A-side component and the B-side component, separately, generate less than 300 ppm of fluoride ion after one week of aging at 50° C.;
• (b) applying a foamed sample, or pre-foamed sample that generates a foamed sample, of the foamable composition to said surface;
• and
• (c) allowing the foamed sample of foamable composition to cure to a foam having a density of less than 48 kg/m3.