A negative-type photosensitive polymer of the present invention is a solvent-soluble negative-type photosensitive polymer which has a structural unit containing an imide ring, the negative-type photosensitive polymer containing a group having a terminal double bond, in which an average value of positive electric charges (?+) of two carbonyl carbons of the imide ring is equal to or less than 0.099 as calculated by a charge equilibration method.

Cellulose cyanoacrylate is employed to bond two surfaces, fill voids or duplicate the shape of a three-dimensional object, Two surfaces may be bonded by placing a sheet of cellulose material between the surfaces and applying cyanoacrylate glue around the edge of the sheet until saturated and allowing it to cure. Paper toweling may favorably be employed as the cellulose material. A break or fracture in an article can be overlaid with a sheet of cellulose that when saturated with cyanoacrylate glue and temporarily held in place and shaped with a releasable film, the fracture can be corrected. A dry powder comprising highly abrasion-resistant particles can be mixed with the cellulose material to enhance abrasion resistance and to improve long-term color stabilityespecially important for dental cavity treatment. To duplicate the shape of a three-dimensional object, a sheet of releasable film is placed over the object, followed by a sheet of cellulose that is then saturated with cyanoacrylate glue. A sheet of releasable film is then placed over the cellulose and used to hold the cellulose in place and shape it as it hardens.

Cellulose cyanoacrylate is employed to bond two surfaces, fill voids or duplicate the shape of a three-dimensional object, Two surfaces may be bonded by placing a sheet of cellulose material between the surfaces and applying cyanoacrylate glue around the edge of the sheet until saturated and allowing it to cure. Paper toweling may favorably be employed as the cellulose material. A break or fracture in an article can be overlaid with a sheet of cellulose that when saturated with cyanoacrylate glue and temporarily held in place and shaped with a releasable film, the fracture can be corrected. A dry powder comprising highly abrasion-resistant particles can be mixed with the cellulose material to enhance abrasion resistance and to improve long-term color stabilityespecially important for dental cavity treatment. To duplicate the shape of a three-dimensional object, a sheet of releasable film is placed over the object, followed by a sheet of cellulose that is then saturated with cyanoacrylate glue. A sheet of releasable film is then placed over the cellulose and used to hold the cellulose in place and shape it as it hardens.

The two-part curable composition has excellent curability, and exhibits flexibility and adhesion durability. The two-part curable composition includes a first reagent containing at least a 2-cyanoacrylic acid ester and a second reagent containing at least a polymer having a hydrolyzable silyl group, in which an elastomer and a curing catalyst for the above polymer are each contained in at least one of the first and second reagents in predetermined amounts. A preferable curing catalyst is a compound having a metal element and an organic group bonded to the metal element via oxygen, or an acid having a pKa of 4 or lower at 25 C. Preferably, a curing accelerator for 2-cyanoacrylic acid ester is contained in at least one of the first and second reagents.

The present invention concerns a two-part curable composition comprising: a first part (component A) comprising at least 51% by weight based on the total weight of the first part, of one or more cyanoacrylate monomer(s), provided that at least one of the cyanoacrylate monomer(s) is a cyanoacrylate monomer comprising a group XOR.sup.b wherein X is a linear or branched alkylene radical optionally interrupted with one or several oxygen atom(s), and R.sup.b is an alkyl group; a second part (component B) comprising: at least one Michael acceptor M selected from the group consisting of (meth)acrylic monomers, (meth)acrylic functionalized oligomers, (meth)acrylic functionalized resins, and mixtures thereof, provided that at least one of the Michael acceptor(s) M comprises at least one group of formula O(CHR.sup.aCH.sub.2O).sub.n where n ranges from 1 to 10 (Michael acceptor M1), and R.sup.a represents CH.sub.3 or H; and a nucleophilic initiator.

Provided is an adhesive composition which exhibits excellent water resistance and warm-water resistance without impairing instantaneous adhesiveness. The 2-cyanoacrylate adhesive composition contains a 2-cyanoacrylic acid ester, and a specific phthalic anhydride derivative, in which the content of the phthalic anhydride derivative is from 0.01 to 5% by mass, relative to the total amount of the adhesive composition. Preferably, the adhesive composition further contains an elastomer.

Two-part cyanoacrylate/free radical curable adhesive systems are provided.

A medical adhesive with good biodegradable performance capable of undergoing crosslinking copolymerization, comprising a mono-alpha-cyanoacrylate and a bis-alpha-cyanoacrylic acid diol ester monomer molecule. The olefinic bonds in the mono-alpha-cyanoacrylate structure are polymerized in the presence of infinitesimal anions to form a solid 3D high polymer; the 3D high polymer is provided with degradation sites on the web-like backbone chain, with clear degradation path and absorbable degradation products. The medical adhesive can be used for wound adhesive, large area wound hemostasia, and visceral and soft tissue wound closure.

An adhesive composition is provided which is excellent in adhesion rate on non-polar hard-to-bond materials and bond gap curability, and further is good in storage stability. It is a 2-cyanoacrylate-based adhesive composition which includes (a) a 2-cyanoacrylic acid ester and (b) an onium salt represented by the following general formula (1):
nC.sup.+A.sup..sub.n-X(1)
wherein, in formula (1), C.sup.+ represents an onium cation, A.sup. represents at least one anion selected from the group consisting of SO.sub.3.sup., OSO.sub.3.sup. and a specific imide anion, X represents a linking group which connects at least two anions together, and n is an integer of 2 or more.

A compound for an organic light-emitting device represented by Formula 1:

##STR00001##

wherein, in Formula 1,

A.sub.1 is selected from an aromatic group and an aromatic group having extended -conjugation,

R.sub.1 is selected from hydrogen and a C.sub.1-C.sub.60 alkyl group,

L.sub.1 and L.sub.2 are each independently selected from O, S, a C.sub.1-C.sub.20 alkylene group, a C.sub.1-C.sub.20 oxyalkylene group, and a C.sub.1-C.sub.20 thioalkylene group; and a C.sub.1-C.sub.20 alkylene group, a C.sub.1-C.sub.20 oxyalkylene group, and a C.sub.1-C.sub.20 thioalkylene group, each substituted with at least one selected from a C.sub.1-C.sub.20 alkyl group and a C.sub.1-C.sub.20 alkoxy group,

n1 and n2 are each independently selected from 0, 1, 2, 3, 4, and 5,

R.sub.2 and R.sub.3 are each independently selected from hydrogen and a first cross-linking group, provided that at least one of R.sub.2 and R.sub.3 is the first cross-linking group, and

X is selected from F, Cl, Br, and I.