Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2001-03-08
2003-06-10
Dawson, Robert (Department: 1712)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C525S100000, C525S105000, C525S106000
Reexamination Certificate
active
06576082
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns a primer composition and a bonding method. More in particular, it relates to a primer composition which is effective for sealing material comprising, as a main ingredient, a saturated hydrocarbon polymer having a hydroxy group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond (hereinafter referred to as “reactive silicon group”) (particularly, isobutylene sealing material having an isobutylene polymer as a main skeleton), as well as bonding method.
BACKGROUND OF THE INVENTION
Elastic sealing materials have been used generally in recent years, for example, in buildings and automobiles. Sealing materials are used being filled at joining portions or gaps between various kinds of members to provide them with water tightness and air tightness. Accordingly, they have to show good adhesion to various kinds of substrates constituting joints or periphery of window frames, that is, inorganic materials such as glass, ceramic, metal, cement and mortar and organic materials such as plastic (hereinafter they are collectively referred to as “substrates”). However, the sealing materials often have insufficient adhesion and use of primers is essential in most cases.
As sealing materials applied to joints in interiors and exteriors of general buildings, silicone, modified silicone, polysulfide and polyurethane series materials have been well-known. Such sealing materials are used selectively based on the concept of using appropriate sealing materials selectively depending on the kind of joints (also including the kind of substrates) so as to “put right material for right place”, and primers of exclusive use adaptable to respective sealing materials have been developed.
On the other hand, isobutylene series sealing materials having isobutylene polymer comprising reactive silicon groups as the main skeleton have been developed recently. The isobutylene series sealing materials have advantageous characteristics in that they are excellent in dynamic conformity, heat resistance, weather proofness, water proofness and coatability, and do not contaminate the periphery of joints and they have a function as a general-purpose sealing material. As a primer effective for the isobutylene series sealing materials, JP-A-Hei.11-343429 (term “JP-A” as used herein means an “unexamined published Japanese patent application”) discloses a primer composition comprising a saturated hydrocarbon polymer having reactive silicon groups. However, there is still a problem that adhesion to less bondable substrates such as metals coated with acrylic paints is not sufficient even when the primer is used.
JP-A-Sho.52-43831 discloses a primer composition comprising a vinyl (acrylic) copolymer having reactive silicon groups as a primer effective upon bonding silicone elastomers to porous substrates such as of concrete or mortar and various kinds of metal substrates. However, when non-polar sealing material such as isobutylene sealing materials described previously is used, affinity with a primer mainly comprising a highly polar vinyl (acrylic) copolymer is poor failing to sometimes obtain sufficient adhesion.
SUMMARY OF THE INVENTION
This invention intends to provide a primer composition having satisfactory adhesion to various kinds of substrates and, particularly, this invention intend to provide a primer composition for favorably bonding a sealing material comprising a saturated hydrocarbon polymer having a reactive silicon group as the main ingredient and various kinds of substrates, and an adhesion method.
The present inventors have made an earnest study for overcoming such problems and have accomplished this invention on the finding that the object can be attained by a primer composition comprising a vinyl copolymer having reactive silicon groups and a saturated hydrocarbon polymer having reactive silicon groups or a polybutadiene polymer having reactive silicon groups.
The present invention relates to:
(1) A primer composition comprising (A) a vinyl polymer having a main chain substantially comprising vinyl copolymer chain and at least one silicon-containing group having a hydroxy group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond at the terminal end of main chain and/or side chain, and
(B) at least one ingredient selected from a group consisting of ingredients (a) and (b):
(a) a saturated hydrocarbon polymer having at least one silicon-containing group having a hydroxy group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond, and
(b) a polybutadiene polymer having at least one silicon containing group having a hydroxy group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond.
(2) A primer composition as defined in (1), which further comprising a silicate compound as a ingredient (C).
(3) A primer composition as defined in (1), which further comprising a silane coupling agent as a ingredient (D).
(4) A primer composition as defined in (1), wherein the vinyl copolymer of the ingredient (A) has a number average molecular weight within a range from 500 to 50,000, and has, per one molecule, one or more hydrolyzable silyl group at the terminal end of the main chain and/or terminal end of the side chain represented by the general formula (1):
wherein R
1
and R
2
represent each, independently, alkyl group of 1 to 20 carbon atoms, aryl group of 6 to 20 carbon atoms, aralkyl group of 7 to 20 carbon atoms, or a triorganosiloxy group represented by (R′)
3
SiO— (R′ represent each independently substituted or not substituted hydrocarbon group of 1 to 20 carbon atoms), X represent each independently hydroxy group or hydrolyzable group, a is one or 0, 1, 2 or 3, b is one of 0, 1 or 2 in which a and b are not simultaneously 0 and m is 0 or an integer of 1 to 19).
(5) A primer composition as defined in (1), wherein the vinyl copolymer of the ingredient (A) is a polymer obtained by copolymerization of monomer ingredient comprising styrene monomer as the essential ingredient.
(6) A primer composition as defined in (1), wherein the saturated hydrocarbon polymer as the ingredient (a) has a number average molecular weight within a range from 500 to 50,000 and has, per one molecule, one or more hydrolyzable silyl group represented by the general formula (1) at the terminal end of the main chain and/or terminal end of the side chain.
(7) A primer composition as defined in (1), wherein the saturated hydrocarbon polymer as the ingredient (a) is a polymer having 50% by weight or more in total of repetition units formed from isobutylene.
(8) A primer composition as defined in (1), wherein the polybutadiene as the ingredient (b) has a number average molecular weight within a range from 500 to 50,000 and has the hydrolyzable silyl group represented by the general formula (1) at the terminal end of the main chain and/or terminal end of side chain in an amount from 0.2 to 7.0 mmol/g.
(9) A primer composition as defined in (3), wherein the silane coupling agent of the ingredient (D) is an amino group-containing silane coupling agent and/or mercaptosilane coupling agent.
(10) A method of bonding a sealing material onto a substrate which comprises coating the primer composition as defined in claim 1 onto the substrate and bonding, to the coated surface, a sealing material comprising, as main ingredient, saturated hydrocarbon polymer having at least one silane containing group having a hydroxy group or hydrolyzable group bonded to the silicon atom and capable of crosslinking by forming a siloxane bond.
DETAILED DESCRIPTION OF THE INVENTION
This invention is to be described more in details.
Hereinafter, “% by weight” is based on the whole weight of the primer composition, and “part” is based on 100 parts of the silyl group-comprising vinyl polymer as the ingredient (A), unless otherwise defined.
The vinyl copolymer comprising reactive silicon groups as the ingredient (A) (hereinafter
Okamoto Toshihiko
Takase Junji
Armstrong Westerman & Hattori, LLP
Dawson Robert
Kaneka Corporation
Keehan Christopher M.
LandOfFree
Primer composition and bonding method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Primer composition and bonding method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Primer composition and bonding method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3139792