	US 12,139,610 B2
	Thermoplastic polymer composition having improved mechanical properties
Shailesh Ratilal Doshi, Kingston (CA); and Qian Deng, Kingston (CA)
Assigned to DuPont Polymers, Inc., Wilmington, DE (US)
Filed by DUPONT POLYMERS, INC., Wilmington, DE (US)
Filed on Jul. 27, 2021, as Appl. No. 17/386,083.
Application 17/386,083 is a division of application No. 14/840,158, filed on Aug. 31, 2015, granted, now 11,104,798.
Claims priority of provisional application 62/059,177, filed on Oct. 3, 2014.
Prior Publication US 2021/0355323 A1, Nov. 18, 2021
Int. Cl. C08L 77/06 (2006.01)

CPC C08L 77/06 (2013.01)

9 Claims

1. A process of making a thermoplastic polymer composition comprising:

A) forming a co-grafted polymeric toughening agent by preparing a mixture, b3), comprising a blend of two or more polyolefins exhibiting at least two glass transition temperatures obtained by feeding in an extruder:

i) 55-90 weight percent of a first polyolefin, b1), with at least one glass transition temperature >−20° C. and a softening temperature >75° C., and is selected from ethylene homo-polymers, propylene homo-polymers and copolymers of ethylene and propylene; and

ii) 10-45 weight percent of a second polyolefin, b2), having highest glass transition temperature <−20° C. and a softening temperature <75° C. and is selected from copolymers of ethylene and alpha olefins and/or dienes, said alpha olefins and/or dienes selected from the group consisting of propylene, 1-butene, 1-hexene; 1-octene, butadiene and norbornene; wherein the weight percents of b1) and b2) are based on 100% of the total weight of i) and ii), and

iii) at least one reactive monomer; and

iv) optionally one peroxide; and

B) melt blending 5 to 40 weight percent of said mixture obtained in step (A) with a polyamide composition comprising:

v) 55 to 90 weight percent semi-crystalline semi-aromatic co-polyamide; wherein said semi-aromatic co-polyamide comprises

a) about 10 to 40 mole percent aromatic repeat units derived from one or more aromatic dicarboxylic acid with 8 to 16 carbon atoms and an aliphatic diamine with 4 to 20 carbon atoms; and

b) about 60 to 90 mole percent aliphatic repeat units derived from one or more aliphatic dicarboxylic acid with 6 to 20 carbon atoms and said aliphatic diamine with 4 to 20 carbon atoms;

vi) 10 to 45 weight percent aliphatic homo-polyamide; wherein said aliphatic homo-polyamide comprises repeat units derived from;

a) an aliphatic dicarboxylic acid with 6 to 20 carbon atoms and an aliphatic diamine with 4 to 20 carbon atoms; or

b) an aliphatic lactam or an aliphatic aminocarboxylic acid with 6 to 20 carbon atoms;

wherein the weight percent of v) and vi) are based on the total weight of v) and vi);

vii) 0 to 15 weight percent of one or more plasticizers;

viii) 0 to 5 weight percent of additives selected from the group consisting of antioxidants, flame retardants, UV stabilizers, light stabilizers, thermal stabilizers, lubricants, and colorants; wherein the weight percent of the mixture b3, components vii), and viii), are based on the total weight of the thermoplastic composition; wherein components v), vi), vii), and viii), are melt blended in step (B) downstream of the first extruder where said mixture, b3) is obtained.