Granted Patent B2

US 12,486,390 · App. 17/622,069 · Granted Dec 2, 2025

Inventors: Santosh S. Bawiskar (Lake Jackson, TX); Guang Ming Li (Lake Jackson, TX); Tianzi Huang (Lake Jackson, TX); Lizhi Liu (Lake Jackson, TX); Xiaosong Wu (Lake Jackson, TX)

Assignee: Dow Global Technologies LLC

C08L23/16C08L2205/025

Abstract

Claims (50)

1 . A composition comprising:

from 20 to 70 weight of a neat non-irradiated ethylene/propylene/non-conjugated polyene terpolymer (nr-EPDM); and

from 80 to 30 weight percent of a neat branched ethylene/propylene/non-conjugated polyene terpolymer (b-EPDM), the b-EPDM comprising

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 100 MU to 130 MU,

(B) a rheology ratio from 95 to 110,

(C) a phase angle δ from 25° to 39°,

(D) a Mooney Relaxation Area (MLRA) from 1600 MU·s to 3000 MU·s, and

(E) an MLRA/ML ratio from 12 s to 25 s;

the composition is oil-free and comprises

(1) a Mooney viscosity (ML 1+4 @ 125° C.) from 79 MU to 120 MU;

(2) a rheology ratio from 71 to 115; and

(3) a phase angle δ from 30° to 39°.

2 . The composition of claim 1 wherein the b-EPDM is a branched ethylene/propylene/5-ethylidene-2-norbornene terpolymer, the b-EPDM comprising

(i) from 50 to 72 weight percent ethylene;

(ii) from 25 to 30 weight percent propylene; and

(iii) from 4.5 to 12 weight percent norbornene.

3 . The composition of claim 2 wherein the nr-EPDM is a non-irradiated ethylene/propylene/5-ethylidene-2-norbornene terpolymer, the nr-EPDM comprising

(i) from 50 to 72 weight percent ethylene;

(ii) from 25 to 30 weight percent propylene; and

iii) from 4.5 to 12 weight percent norbornene.

4 . The composition of claim 1 wherein the nr-EPDM comprises

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 50 Mooney Units (MU) to 88 MU;

(B) a rheology ratio from 35 to 70; and

(C) a phase angle δ from 41° to 60°.

5 . The composition of claim 1 wherein

the b-EPDM has a density from greater than, or equal to, 0.85 g/cc and less than 0.89 g/cc;

the b-EPDM has a chlorine content from greater than, or equal to, 0 parts per million (ppm) to less than, or equal to, 30 parts per million (ppm);

the nr-EPDM has a density from greater than, or equal to, 0.85 g/cc and less than 0.89 g/cc; and

the nr-EPDM has a chlorine content from greater than, or equal to, 0 parts per million (ppm) to less than, or equal to, 30 parts per million (ppm).

6 . The composition of claim 1 comprising 70 weight percent b-EPDM and 30 weight percent nr-EPDM, the composition comprising

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 95 MU to 115 MU;

(B) a rheology ratio from 80 to 92; and

(C) a phase angle δ from 36° to 39°.

7 . The composition of claim 1 comprising 50 weight percent b-EPDM and 50 weight percent nr-EPDM, the composition comprising

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 80 MU to 90 MU;

(B) a rheology ratio from 82 to 92; and

(C) a phase angle δ from 36° to 38°.

8 . The composition of claim 1 comprising 40 weight percent b-EPDM and 60 weight percent nr-EPDM, the composition comprising

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 83 MU to 95 MU;

(B) a rheology ratio from 72 to 98; and

(C) a phase angle δ from 34° to 38°.

9 . The composition of claim 1 comprising 30 weight percent b-EPDM and 70 weight percent nr-EPDM, the composition comprising

(A) a Mooney viscosity (ML 1+4 @ 125° C.) from 79 MU to 90 MU;

(B) a rheology ratio from 71 to 87; and

(C) a phase angle δ from 35° to 39°.

10 . The composition of claim 1 comprising an MLRA/ML ratio from 9.6 s to 16.0 s.

11 . The composition of claim 1 comprising a density from greater than, or equal to, 0.85 g/cc and less than 0.89 g/cc.

12 . The composition of claim 1 comprising a chlorine content from greater than, or equal to, 0 parts per million (ppm) to less than, or equal to, 30 parts per million (ppm).

13 . The composition of claim 3 wherein the b-EPDM comprises from 4.5 to 5.5 weight percent norbornene.

14 . The composition of claim 13 wherein the nr-EPDM comprises from 4.5 to 5.5 weight percent norbornene.

Assignments (1)

Continuity (2)

References Cited (26)