Compositions and methods useful in forming polyether polyurethanes having release properties

In an organic composition reactive with an organic polyisocyanate in a mold to form a molded polyurethane plastic, said composition consisting essentially of an organic polyether having at least two active hydrogen atoms reactive with said polyisocyanate, that improvement imparting the property of self-release from the cavity walls of said mold comprising an organophosphorus compound selected from the class consisting of compounds of the formulas:

• (RO).sub.n R'.sub.3-n P(0)
• and
• (RO).sub.n R'.sub.3-n P
• wherein R is a monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3, mixed with said composition in an amount effective to impart said self-release property.

An organic composition reactive with an organic polyisocyanate in a mold to form a molded polyurethane plastic elastomer wherein said composition consists essentially of a mixture of:

• a. a polymer polyol comprising a major amount of a normally liquid polyoxyalkylene polyol that has a molecular weight of at least 1,500 and a hydroxyl number from 20 to 120 and that contains therein a minor amount of a film-forming organic polymer having a molecular weight of at least 5,000,
• b. an aromatic polyamine having at least two primary amine groups attached to carbon atoms of the same or different aromatic rings, at least one of such carbon atoms being adjacent to a carbon atom having a substituent other than hydrogen,
• c. an aromatic glycol,
• said composition containing from 97 to 65 parts by weight of (a) and from 3 to 35 parts by weight of (b) per 100 parts by weight of (a) and (b) and said composition containing from 1 to 35 parts by weight of (c) per 100 parts by weight of (a) and (c), with the proviso that the composition contains no more than 35 parts by weight of (b) and (c) per 100 parts by weight of (a), (b) and (c) and
• d. an organophosphorus compound selected from the class consisting of phosphatides and compounds of the formulas:
• (RO).sub.n R'.sub.3-n P(O)
• and
• (RO).sub.n R'.sub.3-n P
• wherein R is monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3, mixed in said composition in an amount effective to impart self-release properties to said elastomer.

A method for molding polyurethane plastics in a mold cavity having metal walls comprising inserting into the mold cavity a polyurethane reaction mixture containing an organophosphorus compound selected from the class consisting of compounds of the formulas:

• (RO).sub.n R'.sub.3-n P(O)
• and
• (RO).sub.n R'.sub.3-n P
• wherein R is a monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3, in an amount effective to impart to said mixture the property of self-release from the walls of said cavity, allowing the reaction mixture to react and releasing the resulting polyurethane from said mold.

A method for producing a cellular polyurethane-polyurea elastomer which comprises forming in a mold cavity having metal walls and curing a reaction mixture containing:

• a. a polymer polyol comprising a major amount of liquid polyoxyalkylene polyol that has a molecular weight of at least 1,500 and a hydroxyl number from 20 to 120 and that contains therein a minor amount of a film-forming organic polymer having a molecular weight of at least 5,000,
• b. an aromatic polyamine having at least two primary amine groups attached to carbon atoms of the same or different aromatic rings, at least one of such carbon atoms being adjacent to a carbon atom having a substituent other than hydrogen,
• c. an aromatic glycol,
• d. an organic polyisocyanate in an amount that provides from 0.8 to 1.3 isocyanato groups per active-hydrogen group in the reaction mixture,
• e. a catalytic amount of catalyst for the curing of the reaction mixture to produce the elastomer, and
• f. a blowing agent in an amount sufficient to produce a cellular structure in the elastomer,
• g. an organophosphorus compound selected from the class consisting of phosphatides and compounds of the formulas:
• (RO).sub.n R'.sub.3-n P(0)
• and
• (RO).sub.n R'.sub.3-n P
• wherein R is a monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3,
• said reaction mixture containing from 97 to 65 parts by weight of (a) and from 3 to 35 parts by weight of (b) per 100 parts by weight of (a) and (b) and said reaction mixture containing from 1 to 35 parts by weight of (c) per 100 parts by weight of (a) and (c), with the proviso that the reaction mixture contains no more than 35 parts by weight of (b) and (c) per 100 parts by weight of (a), (b) and (c) and said reaction mixture containing (g) in an amount effective to impart to said elastomer the property of self-release from the walls of said mold cavity.

In a method for producing a molded polyurethane plastic wherein a stream containing an organic polyisocyanate and a stream containing an organic polyether having at least two active hydrogen atoms reactive with said polyisocyanate are impinged against one another to intimately mix same and then are introduced into a mold cavity having metal walls where the resulting mixture is cured to form said molded polyurethane, that improvement providing to said molded polyurethane the property of self-release from the cavity walls of said mold comprising mixing with one of said streams an organophosphorus compound selected from the class consisting of phosphatides and compounds of the formulas:

• (RO).sub.n R'.sub.3-n P(O)
• and
• (RO).sub.n R'.sub.3-n P
• wherein R is a monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3 in an amount effective to impact said self-release property.

An organic composition reactive with an organic polyisocyanate in a mold to form a molded polyurethane plastic, said composition containing:

• a. an organophosphorus compound selected from the class consisting of phosphatides and compounds of the formulas:
• (RO).sub.n R'.sub.3-n P(O)
• and
• (RO).sub.3 R'.sub.3-n P
• wherein R is a monovalent hydrocarbon group of at least 8 carbon atoms, R' is selected from the class consisting of hydrogen, hydroxyl and monovalent hydrocarbon groups, and n is an integer of 1 to 3, mixed in said composition in an amount effective to impart self-release properties to said elastomer, and
• b. a polymer polyol comprising a major amount of a normally liquid polyoxyalkylene polyol that has a molecular weight of at least 1,500 and a hydroxyl number from 20 to 120 and that contains therein a minor amount of a film-forming organic polymer having a molecular weight of at least 5,000.