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US 5,837,773 AGranted
Sheared polymer blends and process for their preparation
AssigneeDSM Copolymer, Inc.
InventorsErrol J. Olivier, Robert T. Patterson, Peter N. Nugara
Life of this patent
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Abstract
A blend and a process for producing that blend in which a high ethylene content ethylene-propylene polymer and a lower ethylene content ethylene-propylene polymer are subjected to simultaneous blending and shearing to reduce their molecular weights and molecular weight distribution. The sheared blend of polymers can function as a shear stable dispersant viscosity index improver with improved lower temperature properties or the hydrocarbon base for multifunctional for viscosity index improvers, motor fuel additives or polymeric dispersants.
Claims53
An ethylene-propylene polymer blend having a number average molecular weight within the range of about 300 to about 5,000 and a molecular weight distribution within the range of about 1.5 to about 5 prepared by the process of simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50.
A derivatized ethylene-propylene polymer blend having a number average molecular weight within the range of about 300 to about 5,000 and a molecular weight distribution within the range of about 1.5 to about 5 prepared by the steps of simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, reacting the polymer with a graft monomer to form a functionalized blend, and further reacting the functionalized blend with a reactive organic compound containing one or more reactive groups selected from the group consisting of primary amines, hydroxyls and thiols.
A process for producing an ethylenepropylene polymer blend comprising simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, with the blending and shearing being carried out such that the polymer blend has a number average molecular weight within the range of about 300 to about 5000.
A process as defined in claim 29 wherein the polyene is present within the range of about 0.1 to about 10 percent based on the total weight of the polymer.
A process for producing an ethylenepropylene polymer blend comprising simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b),
- wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, and reacting the polymer blend with a graft monomer to form a functionalized blend, and further reacting the functionalized blend with a reactive organic compound containing one or more reactive groups consisting of primary amines, hydroxyls and thioles to form a derivatized polymer blend, having a number average molecular weight within the range of about 300 to about 5,000.
1 more element
An ethylene-propylene polymer blend having a number average molecular weight within the range of about 1,000 to 12,000 and a molecular weight distribution within the range of about 1.5 to about 5 prepared by the process of simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50.
A derivatized ethylene-propylene polymer blend having a number average molecular weight within the range of about 1,000 to about 12,000 and a molecular weight distribution within the range of about 1.5 to about 5 prepared by the steps of simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, reacting the polymer with a graft monomer to form a functionalized blend, and further reacting the functionalized blend with a reactive organic compound containing one or more reactive groups selected from the group consisting of primary amines, hydroxyls and thiols.
A process for producing an ethylene-propylene polymer blend comprising simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, with the blending and shearing being carried out such that the polymer blend has a number average molecular weight within the range of about 1,000 to about 12,000.
A process for producing an ethylene-propylene polymer blend comprising simultaneously, in the absence of solvent, blending and shearing:
- (a) an essentially amorphous low ethylene content ethylene-propylene polymer containing an ethylene to propylene mole ratio within the range of 35/65 to 65/35, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- (b) a partially crystalline higher ethylene content ethylene-propylene polymer containing an ethylene to propylene molar ratio within the range of about 65/35 to about 85/15, having a number average molecular weight within the range of about 20,000 to about 150,000 and a molecular weight distribution within the range of about 2 to 7;
- whereby the blending and shearing is carried out under conditions of heat and mechanical work sufficient to create high shear conditions for a time sufficient to reduce the molecular weight and molecular weight distribution of the blend of (a) and (b), wherein the weight ratio of low ethylene content ethylene-propylene polymer (a) to the higher ethylene-propylene polymer (b) is within the range of about 80/20 to about 50/50, and reacting the polymer blend with a graft monomer to form a functionalized blend, and further reacting the functionalized blend with a reactive organic compound containing one or more reactive groups consisting of primary amines, hydroxyls and thioles to form a derivatized polymer blend, having a number average molecular weight within the range of about 1,000 to about 12,000.
Dependencies are inferred from the claim text.