Rigid polyurethane foam and process for producing the same

Claim 2

A process for producing a rigid polyurethane foam which comprises reacting a polyol component with an isocyanate component in the presence of a blowing agent, a reaction catalyst and a foam stabilizer, said polyol component being a mixed polyol composition comprising (a) 48 to 52% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 10 to 40% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 13 to 17% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 9 to 13% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 10 to 14% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, said mixed polyol composition having an average OH value of 440 to 470.

Claim 3

A process according to claim 1, wherein the polyol component and the isocyanate component are used in a reaction ratio of NCO/OH=1.00 to 1.20.

Claim 4

A process according to claim 1, wherein the isocyanate component is a mixture of 50 to 55% by weight of polymethylene polyphenyl diisocyanate and 45 to 50% by weight of sucrose tolylene diisocyanate prepolymer, said mixture having NCO percent of 32 to 34.

Claim 5

A process according to claim 1, wherein the foam stabilizer is a polyalkylene glycol silicone block copolymer represented by the formula: ##STR4## wherein Z 1 and Z 2 are independently --(CH 2 ) a --(OC 2 H 4 ) b --(OC 3 H 6 ) c --OCH 3 ; a is an integer of 3; b is an integer of 15 to 25; c is an integer of 5 to 15; x is an integer of 2 to 4; and y is an integer of 12 to 14.

Claim 6

A rigid polyurethane foam produced by the process of claim 1.

Claim 7

A rigid polyurethane foam produced by the process of claim 2.

Claim 8

A rigid polyurethane foam produced by the process of claim 3.

Claim 9

A rigid polyurethane foam produced by the process of claim 4.

Claim 10

A mixed polyol composition for producing a rigid polyurethane foam comprising (a) 48 to 52% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 10 to 40% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 13 to 17% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 9 to 13% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 10 to 14% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, said mixed polyol composition having an average OH value of 440 to 470.

Claim 11

A mixed polyol composition for producing a rigid polyurethane foam comprising (a) 48 to 52% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 10 to 40% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 13 to 17% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 9 to 13% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 10 to 14% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, said mixed polyol composition having an average OH value of 440 to 470.

Claim 12

A mixed polyol composition according to claim 9, wherein said composition comprises (a) 50% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 12% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 15% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 11% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 12% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, and the average OH value of polyol composition being 450.

Claim 13

A composition for producing a rigid polyurethane foam comprising (A) an isocyanate component, (B) a polyol component comprising (a) 48 to 52% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 10 to 40% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 13 to 17% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 9 to 13% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 10 to 14% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, said mixed polyol composition having an average OH value of 440 to 470, the reaction ratio of (A)/(B) being 1.00 to 1.20 in terms of NCO/OH value, (C) 20 parts by weight or more of a blowing agent per 100 parts by weight of the total polyol components, and (D) 0.1 to 5 parts by weight of a foam stabilizer per 100 parts by weight of the total polyol components.

Claim 14

A composition for producing a rigid polyurethane foam comprising (A) an isocyanate component, (B) a polyol component comprising (a) 48 to 52% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to tolylenediamine, (b) 10 to 40% by weight of a polyol obtained by adding ethylene oxide to bisphenol, (c) 13 to 17% by weight of a polyol obtained by adding propylene oxide to trimethylolpropane, (d) 9 to 13% by weight of a polyol obtained by adding propylene oxide to sucrose, and (e) 10 to 14% by weight of a polyol obtained by adding propylene oxide and ethylene oxide to diethanolamine, said mixed polyol composition having an average OH value of 440 to 470, the reaction ratio of (A)/(B) being 1.00 to 1.20 in terms of NCO/OH value, (C) 20 parts by weight or more of a blowing agent per 100 parts by weight of the total polyol components, and (D) 0.1 to 5 parts by weight of a foam stabilizer per 100 parts by weight of the total polyol components.

Claim 15

A composition according to claim 11, wherein the isocyanate component is a mixture of 50 to 55% by weight of polymethylene polyphenyl diisocyanate and 45 to 50% by weight of sucrose tolylene diisocyanate prepolymer, said mixture having NCO percent of 32 to 34.

Claim 16

A composition according to claim 11, wherein the foam stabilizer is a polyalkylene glycol silicone block copolymer represented by the formula: ##STR5## wherein Z 1 and Z 2 are independently --(CH 2 ) a --(OC 2 H 4 ) b --(OC 3 H 6 ) c --OCH 3 ; a is an integer of 3; b is an integer of 15 to 25; c is an integer of 5 to 15; x is an integer of 15 to 4; and y is an integer of 12 to 14.

Claim 17

A process for using the rigid polyurethane foam of claim 5 as an heat insulating material for refrigerators.