Bituminous composition for shingles

• US 6,120,913 A
• Filed: 04/23/1998
• Issued: 09/19/2000
• Est. Priority Date: 04/23/1998
• Status: Expired due to Term

• Current Assignee: Kraton Polymers Usllc
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Kluttz, Robert Quillin, Heimerikx, Gerardus Wilhelmus Jozef
• Primary Examiner(s): Mullis, Jeffrey C.
• Application Number:
  US09/065,259
• Time in Patent Office: 880 Days
• Field of Search: 524/59, 524/71, 524/401, 428/521, 428/523
• US Class Current: 428/521
• CPC Class Codes: B32B 11/10 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2419/06 Roofs, roof membranes
• CPC Class Codes: B32B 5/02 characterised by structural features of a fibrous or filamentary layer layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

The present invention provides a roofing shingle which is comprised of a support material and a bituminous composition which comprises a bitumen component, less than 15% by weight of a block copolymer composition, based on total weight of block copolymer composition and bitumen component, and more than 40% by weight of a filler, based on total weight of block copolymer, bitumen component and filler, which block copolymer composition comprises at least one block of a conjugated diene and at least two blocks of a monovinylaromatic hydrocarbon, wherein the block copolymer composition has a vinyl content of at least 25% by weight based on the total diene content and optionally a diblock content of 25 wt % or less, and any diblock copolymer present has an apparent molecular weight which is in the range of from 60,000 to 170,000.

Claims

1. A roofing shingle comprised of a support material and a bituminous composition comprising a bitumen component, less than 15% by weight of a block copolymer composition, based on total weight of block copolymer composition and bitumen component, and more than 40% by weight of a filler, based on total weight of the block copolymer composition, bitumen component, and filler, which block copolymer composition comprises at least one block of a conjugated diene and at least two blocks of a monovinylaromatic hydrocarbon, wherein the block copolymer composition has a vinyl content of at least 25% by weight based on the total diene content and a diblock content of 25 wt % or less, and any diblock copolymer present has an apparent molecular weight which is in the range of from 60,000 to 170,000.

2. A shingle as claimed in claim 1, wherein the block copolymer composition has a vinyl content in the range of from 35 to 65% by weight.

3. A shingle as claimed in claim 2, wherein the block copolymer composition has a vinyl content in the range of from 35 to 55% by weight.

4. A shingle as claimed in claim 1, wherein any diblock copolymer present has an apparent molecular weight in the range of from 60,000 to 130,000.

5. A shingle as claimed in claim 1, wherein the block copolymer composition is present in an amount in the range of between 2 and 15% by weight, based on total weight of block copolymer composition and the bitumen component.

6. A shingle as claimed in claim 5, wherein the block copolymer composition is present in an amount in the range of between 5 and 15% by weight, based on total weight of block copolymer composition and the bitumen component.

7. A shingle as claimed in claim 6, wherein the block copolymer composition is present in an amount in the range of between 8 and 12% by weight, based on total weight of block copolymer composition and the bitumen component.

8. A shingle according to claim 1, wherein the bitumen component has a penetration in the range of from 10 to 300 units at 25°

C. (as measured by ASTM D

     5).

9. A shingle according to claim 8, wherein the bitumen component has a penetration in the range of from 50 to 200 units at 25°

C. (as measured by ASTM D

     5).

10. A shingle according to claim 1, wherein the filler is present in an amount in the range of 50 to 70% by weight, based on total weight of block copolymer composition, bitumen component, and filler.