CA1258209A - Reinforced bituminous membrane - Google Patents
Reinforced bituminous membraneInfo
- Publication number
- CA1258209A CA1258209A CA000428075A CA428075A CA1258209A CA 1258209 A CA1258209 A CA 1258209A CA 000428075 A CA000428075 A CA 000428075A CA 428075 A CA428075 A CA 428075A CA 1258209 A CA1258209 A CA 1258209A
- Authority
- CA
- Canada
- Prior art keywords
- bitumen
- membrane
- mopping
- carrier
- underside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
- E04D5/02—Roof covering by making use of flexible material, e.g. supplied in roll form of materials impregnated with sealing substances, e.g. roofing felt
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N5/00—Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch
Abstract
A B S T R A C T
A REINFORCED BITUMINOUS MEMBRANE
A reinforced bituminous membrane, particularly suitable for roofing, comprising a sheet containing a bituminous material and a reinforcement, and furthermore comprising a layer of mopping bitumen at the underside of this sheet.
A REINFORCED BITUMINOUS MEMBRANE
A reinforced bituminous membrane, particularly suitable for roofing, comprising a sheet containing a bituminous material and a reinforcement, and furthermore comprising a layer of mopping bitumen at the underside of this sheet.
Description
`- 63293-2307 This invention relates to a reinforced bituminous membrane which is particularly suitable for roofing and o~her water-proo~ing applications, and to the manufacture thereof.
Conventional built-up roofing consists of layers of ~uch membranes which are successively adhered to the roof substrate and to each other to form a multi-layer system of, e.g., up to ~ plies in situ. Hot applied mopping bitumen is u~ed as adhesive in this system. It is applied using, e.g., a strong mop, the membrane then being rolled onto the layer of hot mopping bitumen.
In winter applications, in particular, the surface of the mopping bitumen tends to cool so rapidly that it is not always possible to obtain a good adhesive bond. This effect is also noticeable when applying hlgh quality polymer modified bitumen membranes which are designed as a 2 layer system using conventional mopping bitumen ~or application.
It has now been found that a layer of mopping bitumen applied ~o the underside of the membrane during manufacture results in improved bonding in otherwise marginal tempera~ure conditlons, when torch applied.
This invention therefore rela~es to a reinforced bituminous membrane, particularly suitable for roofing, comprising a sheet containing a bituminous material which compri~es a mixture of bitumen and a synthetic rubber, having the formula:
A-B-A or A-B (-B-A) in which A represents a polystyrene block and B a polyconjugated diene block, and n is an integer from 1 to 5, and a reinforcement, and furthermore comprising a layer o~ mopping bitumen at the ~$
~L251~2(~
underside of thi~ sheet. The layer of mopping bitumen pre~erably contains a carrier.
The layer of mopping bitumen is applied during the manufacture of the membrane, e.g. by coating the underside of the sheet containing the bitumlnous materlal and the reinforcement with the mopping bitumen during or after the membrane's ~25~3209 manufacture in order to prepare a prefabricated membrane which is ready for use. This coating can e.g. be carried out by spraying.
Preferably the present membrane is manufactured by coating, e.g~ by spraying, a carrier, preferably a fibreglass carrier, on both sides with the mcpping bitumen. The carrier may also be impregnated wlth the ~cpping bitumen. The carrier is then cooled and if desired stored, e.g. in rolls. It is subsequently applied to the underside of the sheet containing the`bituminous material, preferably a mixture of bitumen and a synthetic rubber, and the reinforcement, preferably during the ~anufacture of the latter at elevated temperatures, e.g. at production ~emperatures of at least about 138C. m e mcpping bibumen in this case preferably has a Ring and Ball softening point of 90-98C (ASTM D-3~).
As carrier a fibreglass is preferred to other c æ riers, such as polyester carriers, because it will not shrink or distort. Mbreover it is not too thick as ccmpared to conv~ntional felt carriers.
The untreated fibreglass carrier may have a weight of about 1.85 pcunds per 100 s~uare feat (about 0.09 kg/m7). After treatment with the ~cpping bitumen its weight is about 40 pounds per 100 square feet (about 2 kg/m2).
Ihe carrier thickness is about 0.5 mm when untreated and abcu~ 1.5 to 2 mm after treatment.
Further advantages of the membrane of this invention appear from the following.
In ex*reme low temperature conditicns, e.g. do~n to -18C, mopping bitumen loses temperature very rapidly as it is m~pped out in a thin layer on a rc~f. It has been found that if an open flame (torch) is applied to the surface of the mcpping bitume~
immediataly in front d the advancing roll of membrane, the surface of the mcpping bitumen is quickly raised to an acceptably high temperature. The layer of m~pping bitumen on the underside of the membrane of the i~vention is heated by heat from the torch as well. The net effect is an improved initial bond as the ~2582~9 membran~ is ~olled into the heated mopping bitumen on the roof, despite low ambient temperature conditions.
Furthenmore, the application of specially thickened bitumi-nous membranes (torching felts) by torch is well known m the industry. The torch softens a portion of the bitumen of the membrane and the softened bitumen acts as an in situ adhesive without the neEd for separate application of hot mopp mg bitumen on the roof deck.
If the bituminous material of such a membrane comprises a mixture o~ bitumen and a synthetic rubber, then the synthetic rukber can be damaged by the torching method if a conventional membrane is used. This thermal degradation may occur through exposure to excessively high flame temperatures, even for short periods. This degradation may not be noticed at the time of application but the long tenm performance of the membrane may be seriously im~aired.
If the underside of the membrane is coated with a layer of mcpping bitumen, this la~r, especially if it c~ntains a carrier, provides a protective layer for the thermally sensiti~e rubber during the torching application, in addition to bonding to the substrate.
The reinforoement of the membrane may comprise woven or unwoven fabric, or chopped fibres. Fillers, extenders, plas-ticizers and pigments may also be present.
The bitNmincus material is preferably a petrol~um bitum~n, e.g. having a softening point of at least 75~C.
The synthetic rubber may be present in a prcportion of, e.g., 5-30%w based on the mixture of bitumen and synthetic rubber. Particularly suitable are thenmoplastic rubbers, in particular linear, branched, including star-shaped, block copolymers of styrene and conjugated dienes.
~he linear block copolymer preferably has the formula A-B-A, in whic~ A represents a polystyrene block having a molecular weight of~ e.g., 7,500 to 100,000, and B represents a ~:2582(~
.
polyconjugated diene block, such as a polyisoprene or poly-butadiene block. m e molecular weight of block B is, e.g., 25,000 to 1,000,000.
m e line æ block copolymer may also be partly or completely hydrogenated, in particular as far as block B is concerned.
The branched block copolymer preferably has ~he formula A-~--tB-A)n, wherein A and B ha~e the above-mentioned meaning ana n is an in~eger, suitably from 1 to 5. Also this block ccpolymer may be partly or ocmpletely hydrogenated, in particular as far as blocks B are concerned.
In this specification mopping bitumen means bitumen blown to a softer grade than coating grade blown bitumen and sub-stantially not con~aining a mineral filler or rubber. m e penetration of the mopping bitumen (25C, 100 g, 5 s) is prefer-ably 15-30, more preferably 15-25, 0.1 m~ (ASTM D-5). The Ring and Ball softening point is preferably 75-98C, more preferably 90-98C, (ASTM D-36).
The thickness of the thin layer of mopping bitumen on the membrane is preferably 0.5-2.0 mm, more preferably 0.5-1.0 mm.
The coating of mDpping bitumen is preferably applied to all of the underside of the membrane.
Sticking of the present mEmbranes during storage is avoided by conventional mEans, e.g., by applying a thin layer of a fine grade of sand on the coated surface.
Conventional built-up roofing consists of layers of ~uch membranes which are successively adhered to the roof substrate and to each other to form a multi-layer system of, e.g., up to ~ plies in situ. Hot applied mopping bitumen is u~ed as adhesive in this system. It is applied using, e.g., a strong mop, the membrane then being rolled onto the layer of hot mopping bitumen.
In winter applications, in particular, the surface of the mopping bitumen tends to cool so rapidly that it is not always possible to obtain a good adhesive bond. This effect is also noticeable when applying hlgh quality polymer modified bitumen membranes which are designed as a 2 layer system using conventional mopping bitumen ~or application.
It has now been found that a layer of mopping bitumen applied ~o the underside of the membrane during manufacture results in improved bonding in otherwise marginal tempera~ure conditlons, when torch applied.
This invention therefore rela~es to a reinforced bituminous membrane, particularly suitable for roofing, comprising a sheet containing a bituminous material which compri~es a mixture of bitumen and a synthetic rubber, having the formula:
A-B-A or A-B (-B-A) in which A represents a polystyrene block and B a polyconjugated diene block, and n is an integer from 1 to 5, and a reinforcement, and furthermore comprising a layer o~ mopping bitumen at the ~$
~L251~2(~
underside of thi~ sheet. The layer of mopping bitumen pre~erably contains a carrier.
The layer of mopping bitumen is applied during the manufacture of the membrane, e.g. by coating the underside of the sheet containing the bitumlnous materlal and the reinforcement with the mopping bitumen during or after the membrane's ~25~3209 manufacture in order to prepare a prefabricated membrane which is ready for use. This coating can e.g. be carried out by spraying.
Preferably the present membrane is manufactured by coating, e.g~ by spraying, a carrier, preferably a fibreglass carrier, on both sides with the mcpping bitumen. The carrier may also be impregnated wlth the ~cpping bitumen. The carrier is then cooled and if desired stored, e.g. in rolls. It is subsequently applied to the underside of the sheet containing the`bituminous material, preferably a mixture of bitumen and a synthetic rubber, and the reinforcement, preferably during the ~anufacture of the latter at elevated temperatures, e.g. at production ~emperatures of at least about 138C. m e mcpping bibumen in this case preferably has a Ring and Ball softening point of 90-98C (ASTM D-3~).
As carrier a fibreglass is preferred to other c æ riers, such as polyester carriers, because it will not shrink or distort. Mbreover it is not too thick as ccmpared to conv~ntional felt carriers.
The untreated fibreglass carrier may have a weight of about 1.85 pcunds per 100 s~uare feat (about 0.09 kg/m7). After treatment with the ~cpping bitumen its weight is about 40 pounds per 100 square feet (about 2 kg/m2).
Ihe carrier thickness is about 0.5 mm when untreated and abcu~ 1.5 to 2 mm after treatment.
Further advantages of the membrane of this invention appear from the following.
In ex*reme low temperature conditicns, e.g. do~n to -18C, mopping bitumen loses temperature very rapidly as it is m~pped out in a thin layer on a rc~f. It has been found that if an open flame (torch) is applied to the surface of the mcpping bitume~
immediataly in front d the advancing roll of membrane, the surface of the mcpping bitumen is quickly raised to an acceptably high temperature. The layer of m~pping bitumen on the underside of the membrane of the i~vention is heated by heat from the torch as well. The net effect is an improved initial bond as the ~2582~9 membran~ is ~olled into the heated mopping bitumen on the roof, despite low ambient temperature conditions.
Furthenmore, the application of specially thickened bitumi-nous membranes (torching felts) by torch is well known m the industry. The torch softens a portion of the bitumen of the membrane and the softened bitumen acts as an in situ adhesive without the neEd for separate application of hot mopp mg bitumen on the roof deck.
If the bituminous material of such a membrane comprises a mixture o~ bitumen and a synthetic rubber, then the synthetic rukber can be damaged by the torching method if a conventional membrane is used. This thermal degradation may occur through exposure to excessively high flame temperatures, even for short periods. This degradation may not be noticed at the time of application but the long tenm performance of the membrane may be seriously im~aired.
If the underside of the membrane is coated with a layer of mcpping bitumen, this la~r, especially if it c~ntains a carrier, provides a protective layer for the thermally sensiti~e rubber during the torching application, in addition to bonding to the substrate.
The reinforoement of the membrane may comprise woven or unwoven fabric, or chopped fibres. Fillers, extenders, plas-ticizers and pigments may also be present.
The bitNmincus material is preferably a petrol~um bitum~n, e.g. having a softening point of at least 75~C.
The synthetic rubber may be present in a prcportion of, e.g., 5-30%w based on the mixture of bitumen and synthetic rubber. Particularly suitable are thenmoplastic rubbers, in particular linear, branched, including star-shaped, block copolymers of styrene and conjugated dienes.
~he linear block copolymer preferably has the formula A-B-A, in whic~ A represents a polystyrene block having a molecular weight of~ e.g., 7,500 to 100,000, and B represents a ~:2582(~
.
polyconjugated diene block, such as a polyisoprene or poly-butadiene block. m e molecular weight of block B is, e.g., 25,000 to 1,000,000.
m e line æ block copolymer may also be partly or completely hydrogenated, in particular as far as block B is concerned.
The branched block copolymer preferably has ~he formula A-~--tB-A)n, wherein A and B ha~e the above-mentioned meaning ana n is an in~eger, suitably from 1 to 5. Also this block ccpolymer may be partly or ocmpletely hydrogenated, in particular as far as blocks B are concerned.
In this specification mopping bitumen means bitumen blown to a softer grade than coating grade blown bitumen and sub-stantially not con~aining a mineral filler or rubber. m e penetration of the mopping bitumen (25C, 100 g, 5 s) is prefer-ably 15-30, more preferably 15-25, 0.1 m~ (ASTM D-5). The Ring and Ball softening point is preferably 75-98C, more preferably 90-98C, (ASTM D-36).
The thickness of the thin layer of mopping bitumen on the membrane is preferably 0.5-2.0 mm, more preferably 0.5-1.0 mm.
The coating of mDpping bitumen is preferably applied to all of the underside of the membrane.
Sticking of the present mEmbranes during storage is avoided by conventional mEans, e.g., by applying a thin layer of a fine grade of sand on the coated surface.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A reinforced bituminous membrane, particularly suitable for roofing, comprising a sheet containing a bituminous material which comprises a mixture of bitumen and a synthetic rubber, having the formula:
A-B-A or A-B ?B-A)n in which A represents a polystyrene block and B a polyconjugated diene block, and n is an integer from 1 to 5, and a reinforcement, and furthermore comprising a layer of mopping bitumen at the underside of this sheet.
A-B-A or A-B ?B-A)n in which A represents a polystyrene block and B a polyconjugated diene block, and n is an integer from 1 to 5, and a reinforcement, and furthermore comprising a layer of mopping bitumen at the underside of this sheet.
2. A membrane as claimed in claim 1, wherein the membrane is a torching felt.
3. A membrane as claimed in claim 1 or 2, wherein the mopping bitumen is a blown bitumen having a penetration (25°C, 100 g, 5 s) of 15-30 0.1 mm and a softening point of 75°-98°C.
4. A membrane as claimed in claim 1 or 2, wherein the mopping bitumen is a blown bitumen having a penetration (25°C, 100 g, 5 s) of 15-25 0.1 mm and a softening point of 90°-98°C.
5. A membrane as claimed in claim 1 or 2, wherein the thickness of the coating of mopping bitumen is 0.5-2.0 mm.
6. Manufacture of the membrane of claim 1, wherein the underside of the sheet containing the bituminous material and the reinforcement is coated with the mopping bitumen.
7. Manufacture of the membrane of claim 1, wherein a carrier is coated on both sides with the mopping bitumen, then cooled and subsequently applied to the underside of the sheet containing the bituminous material and the reinforcement.
8. Manufacture as claimed in claim 7, wherein the carrier is impregnated with the mopping bitumen.
9. Manufacture as claimed in claim 7 or 8, wherein the carrier is a fiberglass carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000428075A CA1258209A (en) | 1983-05-13 | 1983-05-13 | Reinforced bituminous membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000428075A CA1258209A (en) | 1983-05-13 | 1983-05-13 | Reinforced bituminous membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1258209A true CA1258209A (en) | 1989-08-08 |
Family
ID=4125225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000428075A Expired CA1258209A (en) | 1983-05-13 | 1983-05-13 | Reinforced bituminous membrane |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1258209A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0533290A2 (en) * | 1991-09-20 | 1993-03-24 | Shell Internationale Researchmaatschappij B.V. | Torchable roll roofing membrane |
| US5447775A (en) * | 1994-02-23 | 1995-09-05 | Shell Oil Company | Torchable roll roofing composition |
-
1983
- 1983-05-13 CA CA000428075A patent/CA1258209A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0533290A2 (en) * | 1991-09-20 | 1993-03-24 | Shell Internationale Researchmaatschappij B.V. | Torchable roll roofing membrane |
| EP0533290A3 (en) * | 1991-09-20 | 1993-06-30 | Shell Internationale Research Maatschappij B.V. | Torchable roll roofing membrane |
| US5308676A (en) * | 1991-09-20 | 1994-05-03 | Shell Oil Company | Torchable roll roofing membrane |
| US5447775A (en) * | 1994-02-23 | 1995-09-05 | Shell Oil Company | Torchable roll roofing composition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |