Sheet materials suitable for use as a floor, wall or ceiling covering material, and processes and intermediates for making the same

• US 6,187,424 B1
• Filed: 08/05/1998
• Issued: 02/13/2001
• Est. Priority Date: 08/08/1997
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Wevers, Ronald, Kjellqvist, Jerker B. I., Thoen, Johan A., Quack, Wolfgang
• Primary Examiner(s): Thibodeau, Paul
• Assistant Examiner(s): Ahmed, Sheeba
• Application Number:
  US09/129,580
• Time in Patent Office: 923 Days
• Field of Search: 428/323, 428/304.4, 428/500, 428/515, 428/904.4, 428/220, 428/332, 524/427, 524/570, 524/579, 524/584, 524/586, 525/240
• US Class Current: 428/220
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 23/0815 Copolymers of ethene with aliphatic 1-olefins
• CPC Class Codes: C08L 2314/06 Metallocene or single site catalysts
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31909 Next to second addition polymer from unsaturated monomers

Abstract

Sheet materials suitable for use as a floor, wall or ceiling covering material are described which comprise (1) a polymer mixture having (A) at least one homogeneously branched ethylene Polymer (A) having a molecular weight distribution, M_w/M_n, less than 3 and a short chain branching distribution index (SCBDI) equal to or greater than 50 percent obtainable by polymerization of ethylene with at least one C₃-C₂₀ α-olefin in the presence of a single site or constrained geometry catalyst; (B) at least one ethylene Polymer (B) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (A) and a TREF elution temperature at least 5° C. greater than the TREF elution temperature of ethylene Polymer (A) and, optionally, (C) at least one ethylene Polymer (C) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (B) and a TREF elution temperature at least 5° C. greater than the TREF elution temperature of ethylene Polymer (B), and (2) optionally a filler at least partially dispersed with a compatibilizer in the polymer mixture, and when less than 10 wt % filler is dispersed in the polymer mixture, then the melt index of Polymer (A) is preferably less than or equal to 1.5 g/10 min., the melt index ratio of Polymer (B) to Polymer (A) is preferably less than or equal to 5.0, and/or Polymer (B) is preferably a homogeneously branched ethylene polymer. Floor, wall and ceiling covering materials and processes for making them according to this invention are also described.

Claims

1. A sheet material suitable for use as a floor, wall or ceiling covering material comprising

(1) a polymer mixture having:

(A) at least one homogeneously branched ethylene Polymer (A) having a molecular weight distribution, M_w/M_n, less than about 3 and a short chain branching distribution index SCBDI equal to or greater than about 50 percent obtainable by polymerization of ethylene with at least one C₃-C₂₀ α

-olefin in the presence of a single site or constrained geometry catalyst;

(B) at least one ethylene Polymer (B) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (A) and a TREF elution temperature at least 5°

C. greater than the TREF elution temperature of ethylene Polymer (A) and, optionally,

(C) at least one ethylene Polymer (C) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (B) and a TREF elution temperature at least 5°

C. greater than the TREF elution temperature of ethylene Polymer (B), and

(2) optionally a filler at least partially dispersed with a compatibilizer in the polymer mixture,

and when less than 10 wt % filler is dispersed in the polymer mixture, then the melt index of Polymer (A) is less than or equal to about 1.5 g/10 min., the melt index ratio of Polymer (B) to Polymer (A) is less than or equal to about 5.0, and/or Polymer (B) is a homogeneously branched ethylene polymer.

2. The sheet material of claim 1 wherein the TREF elution temperature of ethylene Polymer (B) exceeds the TREF elution temperature of ethylene Polymer (A) by at least 10°

C.

3. The sheet material of claim 1 wherein the polymer mixture has a molecular weight distribution, M_w/M_n, less than or equal to about 3.

4. The sheet material of claim 1 wherein the polymer mixture has a melt flow index, I₁₀/I₂, less than or equal to about 10.

5. The sheet material of claim 1 wherein the ratio of the melt index, I₂, of ethylene Polymer (B) to the melt index, I₂, of ethylene Polymer (A) is in the range from about 1.5 to about 5.0.

6. The sheet material of claim 1 wherein ethylene Polymer (A) is a substantially linear ethylene polymer.

7. The sheet material of claim 1 wherein ethylene Polymer (B) is a homogeneously branched ethylene polymer having a molecular weight distribution, M_w/M_n, less than about 3 and an SCBDI greater than or equal to about 50 percent obtainable by polymerization of ethylene with at least one C₃-C₂₀ α

-olefin in the presence of a single site or constrained geometry catalyst.

8. The sheet material of claim 7 wherein Polymer (B) is a substantially linear ethylene polymer characterized by:

0.01 to 3 long chain branches/1000 carbons.

9. The sheet material of claim 1 wherein the polymer mixture comprises less than 20 wt % polypropylene.

10. The sheet material of claim 1 wherein the polymer mixture comprises at least 75 wt % ethylene polymers.

11. The sheet material of claim 1 in which the polymer mixture complies with the equation:

$\frac{\begin{array}{c}\left(\%<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{recovery}@150<br><br>\text{\hspace{1em}<br><br>}<br><br>\min .\right)\times <br><br>\\ \left(\%<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{strain}<br><br>\text{\hspace{1em}<br><br>}@\mathrm{break}\right)\times <br><br>\left(\mathrm{MPa}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{stress}@\mathrm{at}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{break}\right)\end{array}}{\left(\mathrm{flexural}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{modulus}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{in}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{MPa}\right)\times <br><br>\left(\mathrm{Shore}<br><br>\text{\hspace{1em}<br><br>}<br><br>D<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{hardness}\right)}\ge <br><br>500.$

12. The sheet material of claim 11 wherein % recovery @150 min. ≧

95.

13. The sheet material of claim 12 wherein % strain @ break @ 90°

C.≧

150.

14. The sheet material of claim 1 in which the polymer mixture complies with the equation:

15. The sheet material of claim 14 wherein the coefficient of friction is less than or equal to 0.50.

16. The sheet material of claim 15 wherein the flexural modulus is less than or equal to 90.

17. The sheet material of claim 16 wherein the ISO 4586-2 scratch depth is less than or equal to 60 μ

m @ 5 N.

18. The sheet material of claim 1 which contains at least 75 weight percent Polymers (A), (B) and, optionally, (C);

up to 60 weight percent filler; and

an antistatic agent, and has a coefficient of friction less than or equal to 0.40 and a thickness in the range from 0.060 mm to 1 mm.

19. The sheet material of claim 1 having a foam structure.

20. The sheet material of claim 1 having a design imprinted on the surface of the sheet.

21. A floor, wall or ceiling covering comprising at least one layer of a sheet material according to claim 1.

22. The floor, wall or ceiling covering according to claim 21 which has a plurality of layers comprising a backcoat layer and a topcoat layer.

23. The floor, wall or ceiling covering according to claim 22, wherein the topcoat layer comprises the polymer mixture.

24. The floor, wall or ceiling covering of claim 23 wherein the topcoat layer complies with the following equation:

$\frac{\left(\mathrm{Ultimate}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{Tensile}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{Strength}\right)\times <br><br>\left(\mathrm{Ultimate}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{Elongation}\right)}{\left(\mathrm{Shore}<br><br>\text{\hspace{1em}<br><br>}<br><br>D<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{Hardness}\right)\times <br><br>\left(\mathrm{DIN}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{Abrasion}\right)}\ge <br><br>20.$

25. A process for the production of a sheet material suitable for use as a floor, wall or ceiling covering which comprises:

(1) providing ethylene Polymers (A), (B), and optionally (C) in accordance with claim 1;

(2) mixing the ethylene polymers of step (1) at an elevated temperature sufficient for melting those polymers, but below a temperature which causes substantial degradation of those polymers, to form a fluid mixture;

(3) forming the fluid mixture of step (2) into a sheet; and

(4) allowing the sheet of step (3) to cool and solidify.

26. The process according to claim 25 wherein the fluid mixture of step (2) provided by producing a blend of the ethylene Polymers (A), (B), and optionally (C) using a dual reactor system.

27. The process according to claim 25 wherein the fluid mixture of step (2) is (a) cooled, (b) pelletized and (c) fed into a heated mixer or extruder prior to step (3).

28. The process of claim 25 wherein step (3) comprises spread coating.

29. The process of claim 25, wherein step (3) comprises foaming the fluid mixture.

30. A process for producing a floor, wall or ceiling covering comprising applying the fluid mixture in accordance with claim 25 to a backcoat layer.

31. A process for producing a floor, wall or ceiling covering comprising applying the fluid mixture in accordance with claim 25 to a structural layer having a backcoat layer.

32. An intermediate for making a sheet material suitable for use as a floor, wall or ceiling covering material according to claim 25 comprising a pelletized polymer mixture having:

(A) at least one homogeneously branched ethylene Polymer (A) having a molecular weight distribution, M_w/M_n, less than about 3 and an SCBDI equal to or greater than about 50 percent obtainable by polymerization of ethylene with at least one C₃-C₂₀ α

-olefin in the presence of a single site or constrained geometry catalyst;

(B) at least one ethylene Polymer (B) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (A) and a TREF elution temperature at least 5°

C. greater than the TREF elution temperature of ethylene Polymer (A) and, optionally,

(C) at least one ethylene Polymer (C) having a density at least 0.005 g/cm³ greater than the density of ethylene Polymer (B) and a TREF elution temperature at least 5°

C. greater than the TREF elution temperature of ethylene Polymer (B),

wherein the weight ratio of ethylene Polymer (B) to the total amount of ethylene Polymers (A) and (C) in the polymer mixture is at least 0.5, the weight ratio of any ethylene Polymer (C) to ethylene Polymer (A) does not exceed 2.0, and the total amount of ethylene Polymer (A) and any ethylene Polymer (C) in the polymer mixture is at least 25 wt % based on the total amount of polymers in the polymer mixture.