US4368228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bitumen, atactic polypropylene & propylene/ethylene copolymer compositions and waterproofing membranes using the same
Assignee: WATERPROOF ROOF SYSTEMS Inc A CORP OF
•
Filing: 1981-06-12
•
Granted: 1983-01-11
•
Expires: 2001-06-12
Abstract
Abstract This invention relates to a novel bitumen mixture and a high performance prefabricated waterproofing membrane useful for roofing which is obtained by impregnating different layers of reinforcing material with the bitumen mixture. More particularly, the invention relates to a novel bitumen mixture and a waterproofing membrane comprising a series of reinforcing layers including a polyester mat, a mat of fiberglass and a fiberglass net. Each reinforcing layer is impregnated with bitumen mixed with a thermoplastic polymer wherein the polymer is selected from the group consisting of an amorphous copolymer of ethylene/propylene, atactic polypropylene, polyisobutylene and styrene-butadiene-styrene block copolymer. The mixture has a ring and ball softening point of at least 105° C. and preferably about 155° C.
Inventors
- 👤 Romolo Gorgati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:20
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/28; C; C08; C08L; C08L95/00; D; D06; D06N; D06N5/00; E; E04; E04D; E04D5/00; E04D5/02; E04D5/10; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/023; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24355; Y10T428/27; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31815; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
70 words
A prefabricated waterproofing membrane which comprises a series of superposed reinforcing layers including a fiberglass mat, a polyester mat and a fiberglass net, said layers being impregnated with bitumen mixed with at least one thermoplastic polymer selected from the group consisting of an amorphous copolymer of ethylene/propylene, atactic polypropylene, polyisobutylene and styrene-butadiene-styrene block copolymer, the bitumen polymer mixture having a ring and ball softening point of at least 105° C.
Claim 2
Dependent Claim
70 words
A prefabricated waterproofing membrane which comprises a series of superposed reinforcing layers including a fiberglass mat, a polyester mat and a fiberglass net, said layers being impregnated with bitumen mixed with at least one thermoplastic polymer selected from the group consisting of an amorphous copolymer of ethylene/propylene, atactic polypropylene, polyisobutylene and styrene-butadiene-styrene block copolymer, the bitumen polymer mixture having a ring and ball softening point of at least 105° C.
Claim 3
Dependent Claim
54 words
The waterproofing membrane as described in claim 1 wherein the bitumen polymer mixture is further modified by the addition of polymeric material selected from the group consisting of isotactic polypropylene, a mixture of atactic polypropylene polymer and ethylene propylene copolymer and a mixture of atactic polypropylene polymer and ethylene propylene copolymer containing mineral oil.
Claim 4
Dependent Claim
36 words
The waterproofing membrane as described in claim 2 wherein the fiberglass mat weighs about 50-125 g/m 2 , the polyester mat weighs about 50-250 g/m 2 and the fiberglass net weighs about 60-100 g/m 2 .
Claim 5
Dependent Claim
35 words
The waterproofing membrane as described in claim 3 wherein the fiberglass net contains about 25% polyvinyl chloride threads and the fiberglass net is heat fused to the polyester mat prior to being impregnated with bitumen.
Claim 6
Dependent Claim
31 words
The waterproofing membrane as described in claim 3 wherein the fiberglass net is positioned between the fiberglass mat and the polyester mat, the fiberglass mat being the closest to the surface.
Claim 7
Dependent Claim
37 words
The waterproofing membrane as described in claim 5 wherein the bitumen is mixed with an amorphous copolymer of at least one of the materials selected from the group consisting of ethylene propylene, atactic propylene and isotactic polypropylene.
Claim 8
Dependent Claim
44 words
The waterproofing membrane as described in claim 5 wherein the bitumen is mixed with an amorphous copolymer of ethylene propylene and the bitumen polymer mixture is modified with a mixture of atactic polypropylene polymer and ethylene propylene copolymer containing mineral oil and isotactic polypropylene.
Claim 9
Dependent Claim
24 words
The waterproofing membrane as described in claim 1 wherein the bitumen polymer mixture has a ring and ball softening point of about 155° C.
Claim 10
Dependent Claim
13 words
A bitumen polymer mixture which comprises bitumen mixed with amorphous copolymer of ethylene/propylene.
Claim 11
Dependent Claim
13 words
A bitumen polymer mixture which comprises bitumen mixed with amorphous copolymer of ethylene/propylene.
Claim 12
Dependent Claim
55 words
The bitumen polymer mixture as described in claim 9 wherein the bitumen polymer mixture is modified by the addition of materials selected from the group consisting of atactic polypropylene, isotactic polypropylene, a mixture of atactic polypropylene polymer and ethylene propylene copolymer and a mixture of atactic polypropylene polymer and ethylene propylene copolymer containing mineral oil.
Claim 13
Dependent Claim
22 words
The waterproofing membrane as described in claim 1 wherein the bitumen polymer mixture is further modified by the addition of powdered rubber.
Claim 14
Dependent Claim
36 words
The waterproofing membrane as described in claim 1 wherein the fiberglass mat weighs about 50-125 g/m 2 , the polyester mat weighs about 50-250 g/m 2 and the fiberglass net weighs about 60-100 g/m 2 .
Claim 15
Dependent Claim
35 words
The waterproofing membrane as described in claim 12 wherein the fiberglass net contains about 25% polyvinyl chloride threads and the fiberglass net is heat fused to the polyester mat prior to being impregnated with bitumen.
Claim 16
Dependent Claim
31 words
The waterproofing membrane as described in claim 12 wherein the fiberglass net is positioned between the fiberglass mat and the polyester mat, the fiberglass mat being the closest to the surface.
Claim 17
Dependent Claim
22 words
The bitumen polymer mixture as described in claim 9 wherein the bitumen polymer mixture is modified by the addition of powdered rubber.
References Cited (Backward Citations)
US3193439A
Cited
US3336179A
Cited
US3741856A
Cited
US3937640A
Cited
US3753938A
Cited
US3917895A
Cited
LU69480A1
Cited
GB1517595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |